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Bridgeport J-Head Series User Manual
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Bridgeport J-Head Series I Mill Rebuild
Document Number:
BPJ1RBLD_002
Document Version:
2.0.01
Document Version Date:
January 31, 2011
Prepared By:
Hoffman Mechatronics
496 Albrough Blvd.
Colonial Beach, Va 22443
mike_hoffman@
verizon.net
2
Table of Contents
Default Chapter
2
Table of Contents
2
1 Document Information
7
Disclaimer
7
Notes from the Author
7
Copyright
7
Document Organization
8
Change History
8
Dedications and Acknowledgements
8
2 Mill Overview
9
Mill Description
9
Repair Estimates
9
Figure 1 - Mill ID Plate
9
Why Would I Do this
10
Isn't It too Old
10
Figure 2 - J Head
10
Figure 3 - Table and Knee
10
Disassembly/Reassembly Suggestions
11
Figure 4 - Grub Screws, Note the Hollow Locking Screw
12
3 Motor and Drive Section
13
Motor Removal, Inspection, & Reassembly (RIR)
13
Motor Removal
13
Motor Inspection
13
Figure 5 - Motor Nuts
13
Motor Reassembly
14
Motor Replacement
14
Drive Housing Section
15
Drive Housing Removal
15
Figure 6 - Drive Housing Assembly
15
Figure 7 - Power Head Mounting
16
Figure 8 - Drive Housing Timing Belt
16
Drive Housing Inspection
17
Figure 9 - Bolts Fastening Drive Housing Together
17
Figure 10 - Drive Housing Inspection
17
Drive Housing Reassembly
18
Figure 11 - Gear Housing Cover
18
4 J-Head Section
19
Figure 12 - J-Head
19
J-Head R & R
20
J-Head Removal
20
Figure 13 - J-Head Mounting
20
J-Head Reassembly
21
Quill Pinion Shaft RIR
21
Quill Pinion Shaft Removal
21
Quill Pinion Shaft Inspection
22
Figure 14 - Overload Lever Plunger and Spring
22
Figure 15 - Overload Clutch Ring and Circlip
22
Quill Pinion Shaft Reassembly
23
Quill Stop and Quill Indicator RIR
23
Quill Stop and Quill Indicator Removal
23
Figure 16 - Ball Reverse Lever, and Quill Stop Trip Lever
23
Quill Stop Inspection
24
Quill Stop Reassembly
24
Quill and Spindle Removal
24
Quill and Spindle Inspection
25
Figure 17 - Homemade Spanner Nut Wrench
25
Spindle Bearing Reassembly/Replacement
26
Figure 18 - Note the Axial Alignment Asterisk and the Bearing Orientation
26
Figure 19 - Note the Alignment Marks on Outer Races Preparing for Next Step
27
Figure 20 - Aligning with Nosepiece Screw Hole
28
Figure 21 - Homemade Spanner Nut Wrench
28
On Machine Spindle Extraction
29
Feed Driving Gear Assembly RIR
29
Feed Driving Gear Assembly Removal
30
Figure 22 - Worm Gear Cradle Assembly
30
Figure 23 - Feed Driving Gear Assembly
30
Feed Driving Gear Assembly Inspection
31
Feed Driving Gear Assembly Reassembly
31
Feed Reverse Gear Assembly RIR
31
Feed Reverse Gear Assembly Removal
31
Figure 24 - Reverse Feed Gear Assembly
31
5 Turret Section
32
Figure 25 - Reverse Feed Gear Removal
32
Ram Adapter RIR
33
Ram Adapter Removal
33
Ram Adapter Inspection
33
Ram Adaptor Reassembly
33
Figure 26 - Ram Adapter
33
Ram RIR
34
Ram Removal
34
Ram Inspection
34
Figure 27 - Ram Assembly
34
Figure 28 - Turret Base and Ram Lock
34
Ram Reassembly
35
Figure 29 - Ram Installation
35
Turret RIR
36
Turret Removal
36
Figure 30 - Ram Sliding Fixture
36
Turret Inspection
37
Turret Reassembly
37
Figure 31 - Turret Bolts and Cross Member
37
Figure 32 - Turret Reassembly
37
Figure 33 - Turret Cross Member
38
6 0 Table Section
39
Lead Screw Bearings & Brackets RIR
39
Lead Screw Bearings & Brackets Removal
39
Figure 34 - Table Handle, Dial and Nut
39
Lead Screw Bearings & Brackets Inspection
40
Lead Screw Bearings & Brackets Reassembly
40
Figure 35 - Broken Bracket
40
Figure 36 - Bearing Bracket with Bearings Installed
41
Figure 37 - Gib Adjusting Screw
41
Figure 38 - Gib Parallels
41
Figure 39 - Y-Axis Chip Wiper Cover
42
Figure 40 - Y-Axis Gib and Adjusting Screw
42
Figure 41 - Table Nearly Ready for Removal
44
7 Saddle Section
46
Saddle Section Removal
46
Figure 43- Saddle
46
Figure 44- Lead Screw Nut
46
Saddle Section Inspection
47
Figure 45- Lead Screw Nut Bracket
47
Saddle Section Reassembly
48
8 Knee Section
49
Knee Section Removal
49
Figure 46- Knee Gib Area
49
Figure 47- Removing/Reinstalling the Knee
50
Figure 48 - after the Crank and Dial Have Been Removed
50
Knee Section Inspection
51
Figure 49 - Knee Elevating Bevel Gears
51
Figure 50 - Elevating Screw Bearing Retainer Ring
51
Knee Section Reassembly
52
9 Tramming the Mill
53
Bridgeport Method
53
Bearing Race Method
54
Tramming to the Vice
54
10 Maintenance & Lubricants
55
Backlash Adjustment
55
Figure 53 - Feed Nut Bracket
55
Feed Trip Adjustment
56
Spindle Lubricant
56
Figure 54 - Feed Trip Lever
56
Figure 55 - Spindle and Back Gear Lube Cups
56
Way Lubricant
57
Figure 56 - Way Lube Fittings
57
Figure 57 - Knee Lube Fittings
57
11 Troubleshooting
58
Quill Does Not Go more than 3-4 Inches down
58
Quill Feed Does Not Disengage When the Quill Stop Is Hit
58
I Try to Install a Gib and It Stops Short. It Feels Like It Is Hitting Something
58
My Quill Keeps Falling Down, I Have to Lock the Quill in Place for It to Stay up
58
12 CNC Conversion
58
Why Would You Convert to CNC
58
Where Do You Start
59
Phase 1 - the Ball Screws
59
Phase 2 - the Electronics
60
Open Loop System
60
Figure 58 - CNC Electronics
61
Closed Loop System
62
Phase 3 - the X and y Axes
62
Figure 59 - X Axis Drive Tube
63
Figure 60 - y Axis Drive Tube
63
Phase 4 - the Z Axis
64
Phase 5 - the Planetary Gearhead for Z Axis
65
Figure 62 - Z Axis Installation
65
Software Packages
66
The Moral of the Story
66
Figure 63 - Z Axis Planetary Gearbox Installation
66
13 Reference Documents and Websites
68
Documents
68
Websites
68
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Bridgeport J-Head Series Specifications
General
Spindle Taper
R8
Type
Vertical Milling Machine
Table Size
9" x 42"
Quill Travel
5 in
Ram Travel
12 in
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