Difference between revisions of "Powermatic Millrite MVM Milling Machine"

From Hive13 Wiki
Jump to navigation Jump to search
(43 intermediate revisions by 3 users not shown)
Line 1: Line 1:
{{Metalworking Shop}}
 
 
{{Equipment
 
{{Equipment
 
|owner=[[User:Jim]]
 
|owner=[[User:Jim]]
 +
|assetTag=HV0053
 
|model=Powermatic Millrite MVM
 
|model=Powermatic Millrite MVM
 
|arrived=11/2019
 
|arrived=11/2019
 +
|Image=Image:JimD_Millrite_20191111.JPG
 
|doesitwork=Yes
 
|doesitwork=Yes
 
|contact=CNC Warden
 
|contact=CNC Warden
|where=2D
+
|where=Machining
 
|certification=Yes
 
|certification=Yes
|subcat=Metalworking
+
|subcat=Machining
 
|Manual=Media:RF-30_manual.pdf
 
|Manual=Media:RF-30_manual.pdf
 
}}
 
}}
=Overview=
 
  
The "Millrite" is a "knee-and-column" type vertical milling machine.  Cincinnati is credited as the home for early versions of this type of machine from the 1880's.  The product line was intended as a low-cost competitor to the established Bridgeport and other high-class makers of this type of machine, also known as turret mills.  The Millrite was of essentially simple but strong construction and offered - on the basis of one main column.  It was offered with multiple alternative head, ram and table assemblies.
+
==Overview==
 +
This particular "Millrite" is what is known as a [https://en.wikipedia.org/wiki/Milling_(machining) 'knee-and-column, turret-type'] vertical milling machine.
  
This is JimD's personal machine.  It is on indefinite consignment to Hive13 for gentle use by considerate members.  This particular machine is serial number 711226.  It was the 1226th machine made in Cincinnati in 1971Jim bought it from a small machine ship in the New York state finger lake area in 1980,  It has been in JimD's home shop for the past 40 years.
+
It is a manual machine.  It has sufficient weight, power, and rigidity to perform a wide-range of general-purpose metal-cutting (milling and drilling) operationsVertical mills of this type have been ubiquitous in job shops for the past century.
  
Evolution of the Cincinnati company that made this machine:
+
In the capable hands of a knowledgeable user, a sequence of specific harder-metal rotating tools can be safely brought into controlled interference contact with a softer metal workpiece.  The resulting cutting action produces metal chips and finished parts. The action is similar to wood-cutting machines that produce sawdust, but the metal-cutting forces are much higher and less forgiving. A sequence of subtractive milling operations transforms the original workpiece stock to create specific round and flat surface features to precise tolerances. Dimensional tolerances measured in single-digit thousandths of an inch (+/-.001") can be repeatedly produced.
* 1915: The United States Machine Tool Co. was founded in Cincinnati, Ohio.
 
* 1947: United States Machine Tool Co. became the US Machine Tool division of Ransohoff Co.
 
* 1948: US Machine Tool division of Ransohoff Co. merged with Burke Machine Tool and became US Burke Machine Tool Co.
 
* In the 70s: US Burke became part of the Powermatic/Houdaille conglomerate
 
* 1979: following in a KKR leveraged-buyout, the Houdaille company went bankrupt and was lost to history.
 
  
The company's history is mentioned in [amazon.com/s?k=alchemy+burgmaster&Go.x=12&Go.y=16&link_code=qs&tag=oldwoodworkin-20 From Industry to Alchemy: Burgmaster, A Machine Tool Company] by Max Holland. This book was named by Business Week as one of the ten best business books of 1989. We highly recommend this book to anyone interested in the decline of the American manufacturing industry. The book's focus is [http://vintagemachinery.org/mfgindex/detail.aspx?id=1611 Burgmaster Corp.], which was also acquired by Houdaille; because of the Houdaille connection there is some information on Powermatic as well.
+
In the inexperienced hands of a neophyte user, such a mill is highly dangerous. An unsafe milling process can quickly result in serious personal injury and catastrophic damage to the machine.
  
 +
Learning to use such machines has traditionally been a multi-year, on-the-job, experience-based process. Individuals went through a lengthy 'apprentice' period and then spent their entire career working on a single machine to develop the knowledge-base and 'feel" for this highly-skilled trade craft and become a 'machinist' or a 'tool-and-die maker'. There are many ways to be inattentive, careless, do it wrong, and get into trouble.  It is a constant challenge to be attentive, diligent, do it right, and stay safe.
  
Evolution of the product line:
+
==History of this machine==
* Millrite model MV (1960-’64)
 
* Millrite model MVI (1965-’67)
 
* Millrite model MVN (1967-’75)
 
  
This millrite is a versatile manual machine.  It has hand-feed on the X (table) Y (cross-feed), and Z (knee) axes. The standard model had a table with a working surface 7" x 27" with 16" of longitudinal travel.  The feed screws are of generous proportions, a full 7/8" in diameter, of Acme form and run through bronze nuts. The cross feed travel of the table was a useful 8" - whilst the head could also be moved in and out of its swivelling support through a range of 12.5". The combination of these movements means it can bring its cutter as close as 4" to the main column yet reach as far away as 16.5"With the head set to swivel, the cutter was able to sweep along an arc with a maximum radius of 25" (12.5" minimum) and cover, in conjunction with table's longitudinal movement, a length of some 62"With the quill retracted, and the knee lowered, a maximum clearance of 17.75" was available between the spindle nose and table - although 5-inch raiser blocks were available to increase this as required.
+
This particular Millrite MVM was made in Cincinnati in 1971, in the Oakley neighborhood, on Brotherton Avenue, at a company that was founded in 1915. Member JimD bought the machine from as small job shop in upstate New York in 1980It has been in his home shop for the past 39 yearsIn 2019, JimD put this machine on indefinite consignment to Hive13 for gentle use by considerate members.
  
Fitted as standard with as simple, V-belt drive head powered by a 1 hp, 1800 rpm motor, six well-spread spindle speeds were available in each direction of 335,  575,  970,  2550,  3075 and - very useful for running smaller cutters - 4535 rpm. However, at least three different motors are known to have been offered: a 0.75 h.p. with speeds from 250 to 3400, a 1 hp 1200 rpm unit that gave 250,  430,  725,  1160,  2300 and 3400 rpm - and another 1 h.p. type of 900 rpm with a range of 185,  320,  540,  860,  1700 and 2500 rpm.
+
Further information on the history of the company and the Millrite product line can be found on this page https://wiki.hive13.org/view/Powermatic_Millrite_MVM/History
  
 +
==User Certification==
 +
We do Mill and Lathe certification on an as needed basis. Email the warden to request certification. Only the following people are permitted to certify you on the mill:
  
 +
*[[User:JimD|JimD]] (Mill Owner)
 +
*[[User:KevinM|KevinM]] (Machining Warden)
 +
*[[User:ConnerA|ConnerA]]
 +
*[[User:DaveV|DaveV]]
  
For a miller to standard specification the floor space required was approximately 60" x 50" and the weight around 1100 lbs.
+
==Certification Goals – Don’t hurt yourself. Don’t hurt the machine.==
 
 
The spindle quill taper is R8.
 
 
 
=User Certification=
 
We do Mill and Lathe certification on an as needed basis. Email the warden to request certification.
 
Only the following people are permitted to certify you on the mill:
 
 
 
*[[User:JimD|JimD]] (Project Leader - mill owner)
 
*[[User:Brad|Brad]]
 
*Dave Velzy CNC Warden
 
 
 
=Certification Goals – Don’t hurt yourself. Don’t hurt the machine.=
 
  
 
*Mill safety and setup
 
*Mill safety and setup
Line 61: Line 49:
 
*Demonstrate understanding of Backlash
 
*Demonstrate understanding of Backlash
  
In preparation for certification please;
+
In preparation for certification please; Read the manufacturers manual and study the excellent materials from Case Western
Read the manufacturers manual and study the excellent materials from Case Western
 
  
 
http://engineering.case.edu/sears-thinkbox/use/mills
 
http://engineering.case.edu/sears-thinkbox/use/mills
  
Take the milling quiz.  
+
Take the milling quiz.
 +
 
 +
https://www.proprofs.com/quiz-school/story.php?title=mill-quiz When you have a score of 100% print out the certificate and contact the CNC warden for your certification check ride.
 +
==Current Status (2019-11-11)==
 +
The mill is re-assembled and connected to power, available for limited initial use by members that are certified to use this tool.  JimD has consigned a [https://wiki.hive13.org/view/Powermatic_Millrite_MVM_Initial_Tooling starter kit of tooling] for use with the mill.  JimD is also working on a 'Good2Go Mon' badge-activated power box for this machine and other certified-user machines at the Hive.  You are encouraged to use the machine, but are cautioned to be SAFE for your sake, and for the sake of the machine.  Things can get out-of-hand quickly if you do not know what you are doing.
 +
 
 +
Please contact Jim at jim@hive13.org and/or cell 513.300.5164 to share your questions and plans for use of this mill.
 +
==Related Tooling (2019-11-11)==
 +
 
 +
[https://wiki.hive13.org/view/Powermatic_Millrite_MVM_Initial_Tooling Link to page showing the starter kit of consigned tooling for use with the mill.]
 +
 
 +
Traditionally, tooling is sub-divided into two categories; 'Durable' tooling and 'Perishable' tooling.
 +
 
 +
*Durable tooling can include a wide assortment of work-holding devices such as vices, parallel bars, step blocks, clamp sets, and other fixturing that can be general-purpose, or part specific.  The re-usable parts of cutting tools (collets, end-mill holders, drill chucks, and such) are also considered to be durable tooling.  Metrology items such as dial indicators can also be considered as durable tooling.
 +
 
 +
*Perishable tooling includes all the different consumable items such as end mills, drills, cutters, and inserts.  The Hive owns a variety of high speed steel end mills which were purchased used on eBay. You are welcome to use these.  They are in a box under the Enco mill labeled 'Good enough'.  If you damage one, report it to broken (at) hive13 dot org.
  
https://www.proprofs.com/quiz-school/story.php?title=mill-quiz
+
The number of items in a resulting kit of durable and perishable tooling can grow quite large and be very expensive, often growing to exceed the cost of the machine itself. While JimD has consigned a starter set of tooling, the Hive may consider to vote to procure additional tooling if there is sufficient group interest.    You should consider to procure your own perishable tooling, particularly if you have special, or high volume needs.  
When you have a score of 100% print out the certificate and contact the CNC warden for your certification check ride.
 
  
=Current Status=
+
There are many considerations in selecting the proper tooling for a given part and cut. 
  
A defect was identified with the Pinion Assembly (enco part number 6116-6S) via borescope on 2/22/2015Ian and Ryan identified the busticated part.
+
*For the workpiece fixturing, RIGIDITY is the primary consideration.  The part must be held VERY SECURELY to avoid deflection and vibrations from the cutting forces that can be heavy.  An associated consideration is clearance for the range of motion of the cutter.
 +
*For the durable tooling, RIGIDITY and clearance considerations remain of primary importance.  Rigidity typically means short and stubby tool holders for stiffness and vibration resistance purposes.
 +
*For the perishable tooling, RIGIDITY and clearance are still primary considerations, but there are many added factors to consider.  Selecting even a 'simple' end mill requires proper consideration of multiple factors based on the desired cutThese factors include tool material (typically carbide, or high-speed steel); tool coatings (such as TiN); tool diameter; tool length; flute length; number of flutes (typically two flutes (center cutting) or four flutes (NOT center cutting); and corner radius.
  
==Endmills==
+
Even with  selection of the proper workpiece fixturing, tool holder, and cutter, there are additional milling process decisions to make.  These decisions include choice of climb or conventional milling, axial depth of cut, radial depth of cut, chip load per tooth, and related tool RPM and feedrate. It is very easy to apply forces that can break steel tools at the shank.  Such incidents over-stress the machine structures, lead screws, and spindle bearingsFlying pieces of loose tool steel can be a personal hazard.
The endmills are the cutting tools for the milling machine.  Wikipedia has [[wikipedia:Endmill|a page]] for these as well.
 
  
Hive owns a variety of high speed steel end mills which were purchased used on eBay. They are under the mill labeled 'Good enough'
+
There are many web resources to learn about tooling.  This brief [[https://www.youtube.com/watch?v=rKPxfzx3sxE|Haas YouTube Video on avoiding chatter]] is a good start.
  
If you damage one, report it to broken (at) hive13 dot org
+
==Familiarization Details==
  
=WTB (Want to Buy)=
+
The principal elements of the Millrite are detailed in the following:
 +
* Spindle Drive Motor
 +
* Spindle Speed Range (via belt and step pulleys)
 +
* Ram
 +
* Turret
 +
* Head
 +
* Quill
 +
* Knee (Z-Axis)
 +
* Saddle (Y-Axis)
 +
* Table (X-Axis)
 +
* Column and Base
  
*Toolbox // Tool Chest to hold machining parts
+
==How To's==
*Rotary Table (8"+), one that can be used vertically & horizontally ($100 - $300+)
+
* Pre-Planning
*Boring head + Boring bar set
+
* Change Spindle Speed (via belt and step pulleys)
**Boring head ~$75
+
* Change Tool in R8 Spindle
**Boring bar set ~($20 - $60)
+
* Dry-run cut before actual cut
 +
* Clean-up when done (leave it better than you found it)
  
==Priority Purchase List==
+
==Preventive Maintenance==
 +
* After each use (each certified member user)
 +
* Once-per-month (clean the Hive Saturdays)
 +
* Once-per-year (JimD and/or area warden)
  
 
*Way Oil (Vactra #2)-- [http://www.use-enco.com/1/1/45214-105480-mobil-no-2-vactra-2-way-oil.html]
 
*Way Oil (Vactra #2)-- [http://www.use-enco.com/1/1/45214-105480-mobil-no-2-vactra-2-way-oil.html]
*1"x2" 6061 Aluminum (Soft Jaw material) [http://www.onlinemetals.com/merchant.cfm?pid=1186&step=4&showunits=inches&id=997&top_cat=60]
+
*WD-40
 +
 
  
 
==Sites to buy from for cheap==
 
==Sites to buy from for cheap==
Line 101: Line 118:
 
*http://tools4cheap.net/
 
*http://tools4cheap.net/
 
*http://littlemachineshop.com/
 
*http://littlemachineshop.com/
*http://www.use-enco.com
 
  
=Gallery=
 
==Milled Items==
 
{| class="wikitable"
 
|-
 
| <flickr > 6920286374 |<nowiki>m|thumb</flickr></nowiki>
 
| <flickr > 7066364307 |<nowiki>m|thumb</flickr></nowiki>
 
| <flickr > 6919913940 |<nowiki>m|thumb</flickr></nowiki>
 
|}
 
  
==Mill==
 
{| class="wikitable"
 
|-
 
| <flickr > 6886542264 |<nowiki>m|thumb</flickr></nowiki>
 
| <flickr > 7032639597 |<nowiki>m|thumb</flickr></nowiki>
 
| <flickr > 6886543914 |<nowiki>m|thumb</flickr></nowiki>
 
|-
 
| <flickr > 7032641437 |<nowiki>m|thumb</flickr></nowiki>
 
| <flickr > 6886545912 |<nowiki>m|thumb</flickr></nowiki>
 
| <flickr > 7032643357 |<nowiki>m|thumb</flickr></nowiki>
 
|-
 
| <flickr > 6886547806 |<nowiki>m|thumb</flickr></nowiki>
 
| <flickr > 7032645119 |<nowiki>m|thumb</flickr></nowiki>
 
| <flickr > 6886549520 |<nowiki>m|thumb</flickr></nowiki>
 
|-
 
| <flickr > 6909235372 |<nowiki>m|thumb</flickr></nowiki>
 
|[[File:Scale on Mill.jpg|thumb|iGaging scale on Z axis of mill]]
 
|
 
|}
 
 
=Resources=
 
 
==Manuals & Guides==
 
==Manuals & Guides==
  
Line 140: Line 127:
 
*[http://vintagemachinery.org/mfgindex/detail.aspx?id=132 Vintage Machinery Website History of the Burke Machine Tool Company]
 
*[http://vintagemachinery.org/mfgindex/detail.aspx?id=132 Vintage Machinery Website History of the Burke Machine Tool Company]
 
*[http://rick.sparber.org/TM.pdf "Traming" a mill drill]
 
*[http://rick.sparber.org/TM.pdf "Traming" a mill drill]
*[http://rick.sparber.org/ma.htm#4 Motherload of RF-30 Mill Drill guides]
 
  
 
==Books==
 
==Books==
Line 151: Line 137:
 
==Supplies & Parts==
 
==Supplies & Parts==
  
*[http://www.use-enco.com/CGI/INSRIT?PMAKA=105-1110 Enco product page]
+
*[http://www.dcmorrison.com D.C.Morrison Company in Covington, KY (reference Burke Milling Machine parts)]
 
 
==General Information==
 
 
 
*[http://www.jalopyjournal.com/forum/showthread.php?t=267465 Someone else who picked one up (Ours is nicer)]
 

Revision as of 22:05, 27 June 2021


Hive13 Equipment
List of All Documented Equipment
JimD Millrite 20191111.JPG
Owner/Loaner: User:Jim
Hive13 Asset Tag: HV0053
Make/Model: Powermatic Millrite MVM (google)
Arrival Date: 11/2019
Does it work?: Yes
Certification Needed?: Yes
Contact: CNC Warden
Floorplan: Machining
Manual: Manual
Powermatic_Millrite_MVM_Milling_Machine.png



Overview

This particular "Millrite" is what is known as a 'knee-and-column, turret-type' vertical milling machine.

It is a manual machine. It has sufficient weight, power, and rigidity to perform a wide-range of general-purpose metal-cutting (milling and drilling) operations. Vertical mills of this type have been ubiquitous in job shops for the past century.

In the capable hands of a knowledgeable user, a sequence of specific harder-metal rotating tools can be safely brought into controlled interference contact with a softer metal workpiece. The resulting cutting action produces metal chips and finished parts. The action is similar to wood-cutting machines that produce sawdust, but the metal-cutting forces are much higher and less forgiving. A sequence of subtractive milling operations transforms the original workpiece stock to create specific round and flat surface features to precise tolerances. Dimensional tolerances measured in single-digit thousandths of an inch (+/-.001") can be repeatedly produced.

In the inexperienced hands of a neophyte user, such a mill is highly dangerous. An unsafe milling process can quickly result in serious personal injury and catastrophic damage to the machine.

Learning to use such machines has traditionally been a multi-year, on-the-job, experience-based process. Individuals went through a lengthy 'apprentice' period and then spent their entire career working on a single machine to develop the knowledge-base and 'feel" for this highly-skilled trade craft and become a 'machinist' or a 'tool-and-die maker'. There are many ways to be inattentive, careless, do it wrong, and get into trouble. It is a constant challenge to be attentive, diligent, do it right, and stay safe.

History of this machine

This particular Millrite MVM was made in Cincinnati in 1971, in the Oakley neighborhood, on Brotherton Avenue, at a company that was founded in 1915. Member JimD bought the machine from as small job shop in upstate New York in 1980. It has been in his home shop for the past 39 years. In 2019, JimD put this machine on indefinite consignment to Hive13 for gentle use by considerate members.

Further information on the history of the company and the Millrite product line can be found on this page https://wiki.hive13.org/view/Powermatic_Millrite_MVM/History

User Certification

We do Mill and Lathe certification on an as needed basis. Email the warden to request certification. Only the following people are permitted to certify you on the mill:

Certification Goals – Don’t hurt yourself. Don’t hurt the machine.

  • Mill safety and setup
  • Tool selection for milling operations
  • Holding parts using the machinist vice and parallels
  • Change tools and set spindle speeds
  • “Zero” the X, Y and Z axis using the DRO
  • Perform basic facing cuts on steel
  • Mount and secure work using parallels and hold downs
  • Demonstrate understanding of Backlash

In preparation for certification please; Read the manufacturers manual and study the excellent materials from Case Western

http://engineering.case.edu/sears-thinkbox/use/mills

Take the milling quiz.

https://www.proprofs.com/quiz-school/story.php?title=mill-quiz When you have a score of 100% print out the certificate and contact the CNC warden for your certification check ride.

Current Status (2019-11-11)

The mill is re-assembled and connected to power, available for limited initial use by members that are certified to use this tool. JimD has consigned a starter kit of tooling for use with the mill. JimD is also working on a 'Good2Go Mon' badge-activated power box for this machine and other certified-user machines at the Hive. You are encouraged to use the machine, but are cautioned to be SAFE for your sake, and for the sake of the machine. Things can get out-of-hand quickly if you do not know what you are doing.

Please contact Jim at jim@hive13.org and/or cell 513.300.5164 to share your questions and plans for use of this mill.

Related Tooling (2019-11-11)

Link to page showing the starter kit of consigned tooling for use with the mill.

Traditionally, tooling is sub-divided into two categories; 'Durable' tooling and 'Perishable' tooling.

  • Durable tooling can include a wide assortment of work-holding devices such as vices, parallel bars, step blocks, clamp sets, and other fixturing that can be general-purpose, or part specific. The re-usable parts of cutting tools (collets, end-mill holders, drill chucks, and such) are also considered to be durable tooling. Metrology items such as dial indicators can also be considered as durable tooling.
  • Perishable tooling includes all the different consumable items such as end mills, drills, cutters, and inserts. The Hive owns a variety of high speed steel end mills which were purchased used on eBay. You are welcome to use these. They are in a box under the Enco mill labeled 'Good enough'. If you damage one, report it to broken (at) hive13 dot org.

The number of items in a resulting kit of durable and perishable tooling can grow quite large and be very expensive, often growing to exceed the cost of the machine itself. While JimD has consigned a starter set of tooling, the Hive may consider to vote to procure additional tooling if there is sufficient group interest. You should consider to procure your own perishable tooling, particularly if you have special, or high volume needs.

There are many considerations in selecting the proper tooling for a given part and cut.

  • For the workpiece fixturing, RIGIDITY is the primary consideration. The part must be held VERY SECURELY to avoid deflection and vibrations from the cutting forces that can be heavy. An associated consideration is clearance for the range of motion of the cutter.
  • For the durable tooling, RIGIDITY and clearance considerations remain of primary importance. Rigidity typically means short and stubby tool holders for stiffness and vibration resistance purposes.
  • For the perishable tooling, RIGIDITY and clearance are still primary considerations, but there are many added factors to consider. Selecting even a 'simple' end mill requires proper consideration of multiple factors based on the desired cut. These factors include tool material (typically carbide, or high-speed steel); tool coatings (such as TiN); tool diameter; tool length; flute length; number of flutes (typically two flutes (center cutting) or four flutes (NOT center cutting); and corner radius.

Even with selection of the proper workpiece fixturing, tool holder, and cutter, there are additional milling process decisions to make. These decisions include choice of climb or conventional milling, axial depth of cut, radial depth of cut, chip load per tooth, and related tool RPM and feedrate. It is very easy to apply forces that can break steel tools at the shank. Such incidents over-stress the machine structures, lead screws, and spindle bearings. Flying pieces of loose tool steel can be a personal hazard.

There are many web resources to learn about tooling. This brief [YouTube Video on avoiding chatter] is a good start.

Familiarization Details

The principal elements of the Millrite are detailed in the following:

  • Spindle Drive Motor
  • Spindle Speed Range (via belt and step pulleys)
  • Ram
  • Turret
  • Head
  • Quill
  • Knee (Z-Axis)
  • Saddle (Y-Axis)
  • Table (X-Axis)
  • Column and Base

How To's

  • Pre-Planning
  • Change Spindle Speed (via belt and step pulleys)
  • Change Tool in R8 Spindle
  • Dry-run cut before actual cut
  • Clean-up when done (leave it better than you found it)

Preventive Maintenance

  • After each use (each certified member user)
  • Once-per-month (clean the Hive Saturdays)
  • Once-per-year (JimD and/or area warden)
  • Way Oil (Vactra #2)-- [1]
  • WD-40


Sites to buy from for cheap


Manuals & Guides

Books

Supplies & Parts