Difference between revisions of "Powermatic Millrite MVM/History"
(Created page with " Cincinnati is credited as the home for early versions of this type of machine starting in the 1880's. This particular Millrite was made in Cincinnati, in the Oakley neighb...")
Revision as of 10:48, 17 November 2019
Cincinnati is credited as the home for early versions of this type of machine starting in the 1880's. This particular Millrite was made in Cincinnati, in the Oakley neighborhood, on Brotherton Avenue at a company that was founded in 1915. It is serial number 711226. It was the 1226th machine made in 1971,
This is JimD's personal machine. It is on indefinite consignment to Hive13 for gentle use by considerate members. Jim 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 features an essentially simple but strong construction. It was offered in several sizes with multiple alternative head, ram, and power configurations.
The product line was intended as a low-cost competitor to the established (and somewhat larger) Bridgeport machines made in Connecticut.
Evolution of the Cincinnati company that made this machine:
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 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 Burgmaster Corp., which was also acquired by Houdaille; because of the Houdaille connection there is some information on Powermatic as well.
Evolution of the product line:
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.
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.
For the standard specification miller, the floor space requirement is approximately 60" x 50" and the weight is around 1100 lbs.
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:
JimD (mill owner) KevinM (CNC warden) ConnerA (metalworking warden) DaveV (COO) 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
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 firstname.lastname@example.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.