Bridgeport Knee Mill

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Bridgeport Knee Mill
BridgeportMill2.jpg
Owner/Loaner PS:One
Serial Number {{{serial}}}
Make/Model Bridgeport Series I knee mill
Arrival Date Dec 2013
Usability yes
Contact Danger Committee, Area Host (Dean Anderson)
Where Machine Shop
Certification Needed yes
Hackable no
Estimated Value ~$6000

Bridgeport Knee Mill https://wiki.pumpingstationone.org/Bridgeport_Knee_Mill


Description

A recent model Knee Mill made by the Bridgeport company. This is the gold-standard small shop manual milling machine in the US. Most other mills of the same size are direct copies of the bridgeport design. This particular machine is a Series I, J-head with a mechanical variable speed drive. The machine has a power quill feed built into the head, in addition to the additional equipment listed below. This machine is capable of facing, surfacing, drilling and slotting in materials ranging from plastics to mild steel. Harder metals may be cut if special cutters and coolant are available. This machine is not equipped with CNC controls, consequently curved paths are limited to circular arcs. These can be cut on pieces that can be mounted on the 8" rotary table or approximated to a desired precision using the simple or smooth arc functions of the DRO.

Personal Tooling and Learning Resources

Equipment

Item Description Supplier Cost
Cutting bits A set of sharp cutters you don't have to share can be purchased from McMaster, Enco or Shars ~$50 and up

Learning

Available Equipment

  • Power feed Model 8F (need to verify) (x axis)
  • Digital Read Out (DRO) (X-axis and Y-axis are functioning, Z-axis needs to be mounted)
  • Kurt 6" vise
  • Hold down set
  • collet set
  • Palmgren 8" Rotary Table
  • boring heads
  • fly cutters
  • assorted 2 flute end mills
  • tapping heads
  • tilting table
  • spindle square

Repair and Maintenance

Please see the service manual.

Maintenance

Above the high/low/neutral speed selector, there is a plate listing how frequently oiling should occur.

The tram and nod of the head, as well as the squaring of the vice, should be checked by anyone who desires high precision. Because hackerspace, there is no guarantee when they were last adjusted.

Repairs

The X-axis handle (opposite the power feed) is missing the spring.

The handle for the Z-axis front lock has snapped off. The rabbit hole is deeper than expected, or may just be a handle that can be removed.

The screw to prevent collets from rotating in the spindle is frequently removed, as some collets won't fit with it in there and it can cause bigger problems if it shears off. This won't be repaired.

The power feed appears to be leaking oil. Parts that we should consider replacing:

  • 61 11636413 Seal, Shaft quantity 1
  • 72 11630134 Gasket, Cover quantity 1
  • 33 11630261 Bearing, Single Row, Loose Fit, quantity 2; these should be available from a bearing distributor

Good sources for Bridgeport parts: High Quality Tools, H&W Machinery Repair, Mataco

Upgrades

The Z-axis DRO is not yet mounted. Please speak to Dean before forging ahead with that.

Authorization

This tool requires authorization for use

Authorization on this tool requires previous Tier 1 Cold Metals Authorization. Because of the inherent danger of using a large milling machine, authorizations on the Bridgeport Mill will only be given by members with significant experience with mills of this type. A list of members who can authorize on the Bridgeport mill may be found below.

Authorizers

Mike Warot
Ed Bennett
Ryan Pierce
Derek Bever
Everett Wilson
Tucker Tomlinson(not currently a member)
Alan Baker
Todd Allen

Currently Authorized Users

Qualified Member Trained By Proctored By
Tucker Tomlinson Danger Committee
Mike Warot Danger Committee
Ed Bennett Danger Committee
John-Paul(JP) Debauge Danger Committee
Ryan Pierce JP Debauge Ed Bennett
Everett Wilson JP Debauge Ryan Pierce
Derek Bever JP Debauge Everett Wilson
Elizabeth Koprucki JP Debauge Ryan Pierce, Everett Wilson
Anna Yu Ed Bennett Ed Bennett
Dean Anderson Ed Bennett Ed Bennett
Bart Dring Ed Bennett Ed Bennett
Greg "Nerobro" Teiber JP Debauge JP Debauge
Ray Doeksen JP Debauge JP Debauge
"Colorado" Rob Riggs JP Debauge Everett Wilson
Jeremy Bloyd-Peshkin Ryan Pierce Ryan Pierce
Todd Allen JP Debauge Everett Wilson
Ron Olson Derek Bever and Everett Wilson Everett Wilson
Michael Skilton Derek Bever and Everett Wilson Todd Allen
Alan Baker Tucker Tomlinson
Tom Judge Everett Wilson Everett Wilson
Ron Bean Todd Allen Todd Allen
George Shaw Todd Allen Todd Allen
Arturo Duarte JP Debauge Todd Allen
Joao Santos Todd Allen Dean Anderson
Chris Agocs Everett Wilson Todd / Everett
Lucas Goossen Todd Allen Todd Allen
Ben Bogler Everett Wilson Todd Allen

List of Provisionally Authorized Users

These persons have completed the classroom portion of the authorization and have started their authorization project. They are provisionally authorized to complete their authorization project under supervision of a proctor who may be any of the authorized persons, listed above.

Provisionally Qualified Member Trained By
David Fell Ryan Pierce and Ed Bennett
Michael Leinartas Ryan Pierce and Ed Bennett
Sergey Nekrasov Ryan Pierce and Ed Bennett
Mark Cabael Todd Allen