Powermatic Millrite MVM Milling Machine

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Owner/Loaner: User:Jim
Hive13 Asset Tag: None
Make/Model: Powermatic Millrite MVM (google)
Arrival Date: 11/2019
Does it work?: Yes
Certification Needed?: Yes
Contact: CNC Warden
Floorplan: 2D
Manual: Manual
Powermatic_Millrite_MVM_Milling_Machine.png



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 several alternative head, ram and table assemblies.

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 1971. 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.

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 Powermatic/Houdaille
  • Millrite model MV (1960-’64)
  • Millrite model MVI (1965-’67)
  • Millrite model MVN (1967-’75)

It has a travel of 185mm forward and back, 430mm left to right, and 130mm on the spindle. (7.25" x 16.875" x 5.125")

The collet 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 (Project Leader - mill owner)
  • Brad
  • Dave Velzy CNC Warden

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

A defect was identified with the Pinion Assembly (enco part number 6116-6S) via borescope on 2/22/2015. Ian and Ryan identified the busticated part.

Endmills

The endmills are the cutting tools for the milling machine. Wikipedia has 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'

If you damage one, report it to broken (at) hive13 dot org

WTB (Want to Buy)

  • Toolbox // Tool Chest to hold machining parts
  • Rotary Table (8"+), one that can be used vertically & horizontally ($100 - $300+)
  • Boring head + Boring bar set
    • Boring head ~$75
    • Boring bar set ~($20 - $60)

Priority Purchase List

  • Way Oil (Vactra #2)-- [1]
  • 1"x2" 6061 Aluminum (Soft Jaw material) [2]

Sites to buy from for cheap

Gallery

Milled Items

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Mill

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iGaging scale on Z axis of mill

Resources

Manuals & Guides

Books

Supplies & Parts

General Information