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501337 CAM - Control, Shop Smith Mark VII
Posted: Wed Oct 16, 2024 9:22 am
by jafpanda
Is anyone looking or have information regarding the 1963 Mark VII Part number 501337 Cam - Control?
- PN 501337 Cam - Control, 1963 Mark VII
- IMG_6700.jpeg (572.57 KiB) Viewed 2777 times
Re: 501337 CAM - Control, Shop Smith Mark VII
Posted: Wed Oct 16, 2024 10:12 am
by edma194
Should be multiple threads on this subject. Here is one to get you started:
viewtopic.php?t=21276
Re: 501337 CAM - Control, Shop Smith Mark VII
Posted: Wed Oct 16, 2024 11:38 am
by jafpanda
Thanks Ed, I’ve seen many of the posts regarding the woes and advice surrounding the original Speed Control CAM.
It was molded from a plastic like (Delrin 500) material.
Typically it would melt as a result of the CAM Follower’s bearing seizing up.
The Delrin 500 NC10’s temperature of deflection under load, 1.80 MPa is about 93 degrees C.
Just guessing, but I think it was a design decision for it to fail when the CAM Follower’s bearing required replacement. Bearings that reach 100 degrees C aren’t really useful.
I had a bunch of Mark VII stuff scanned into a computer… but then the hard drive crashed.
Somewhere I have an original blueprint of the CAM along with original manuals. The BP was pretty hard to read since the quality wasn’t very good. I made about 20 CAM parts (CNC from Delrin) and 1 from aluminum about 15 years ago.
I’m thinking about recreating the 3D CAD and a 2D drawing to see how well a 3D printer would compare to the CNC parts I have.
So, bottom line… is there anyone out there that would be interested in this topic?
Re: 501337 CAM - Control, Shop Smith Mark VII
Posted: Wed Oct 16, 2024 1:02 pm
by GetterDone
jafpanda wrote: Wed Oct 16, 2024 11:38 am
Thanks Ed, I’ve seen many of the posts regarding the woes and advice surrounding the original Speed Control CAM.
It was molded from a plastic like (Delrin 500) material.
Typically it would melt as a result of the CAM Follower’s bearing seizing up.
The Delrin 500 NC10’s temperature of deflection under load, 1.80 MPa is about 93 degrees C.
Just guessing, but I think it was a design decision for it to fail when the CAM Follower’s bearing required replacement. Bearings that reach 100 degrees C aren’t really useful.
I had a bunch of Mark VII stuff scanned into a computer… but then the hard drive crashed.
Somewhere I have an original blueprint of the CAM along with original manuals. The BP was pretty hard to read since the quality wasn’t very good. I made about 20 CAM parts (CNC from Delrin) and 1 from aluminum about 15 years ago.
I’m thinking about recreating the 3D CAD and a 2D drawing to see how well a 3D printer would compare to the CNC parts I have.
So, bottom line… is there anyone out there that would be interested in this topic?
I will be when I get time to check the condition of the cam in the one I purchased recently.
I have not had time to use it yet.
Re: 501337 CAM - Control, Shop Smith Mark VII
Posted: Wed Oct 16, 2024 8:42 pm
by JPG
Interested? You are asking one who paid $80 for a cnc aluminum one a few years back.
And more recently 3D printed one.
Yes I think so!
Re: 501337 CAM - Control, Shop Smith Mark VII
Posted: Fri Oct 18, 2024 7:53 am
by jafpanda
Thanks JPG for the interest.
I’ve begun the restoration of the CAM ~ Control documentation.
The original Magna American Corporation (9-18-1963 revision “C”) blueprint is the basis to recreate an ANSI C size 2D drawing and subsequent blender 3D CAD model.
Re: 501337 CAM - Control, Shop Smith Mark VII
Posted: Sun Oct 20, 2024 1:38 pm
by JPG
If you post (or e-mail) to me the full drawing at the same resolution, I may be able to improve legibility similar to partial effort below.
The original being an "E" size document may require it being done in sections. Focus is critical!
- mvii cam draw b4 after.jpg (461.29 KiB) Viewed 2579 times
Re: 501337 CAM - Control, Shop Smith Mark VII
Posted: Sun Oct 20, 2024 2:38 pm
by jafpanda
Thanks JPG,
The blueprint note, "FULL SCALE" image on the print I have measures to the actual part size; it is correct.
Therefore, the blueprint note, "SCALE 2 x SIZE" implies that the print dimensions are doubled.
Additionally, the blueprint measurement is 17 x 22 (ANSI C dimensions).
The attachment shows a Mark VII CAM part against an 8.5x11 printed document that I made (so far).
The outline on the drawing is slightly covered by the part.
So, I'm pretty confident that the dimensions on the drawing are quite good.
I'll post a 8.5 x 11 pdf of the drawing I'm making in a bit.
I would appreciate any comments for correction.
Selfless Caveat: I'm no draftsman. The last time I touched a drafting board was in the 70's.
- Mark VII CAM part against 8.5x11 printed document.jpg (139.57 KiB) Viewed 2575 times
Re: 501337 CAM - Control, Shop Smith Mark VII
Posted: Sun Oct 20, 2024 5:10 pm
by jafpanda
Comments and corrections are welcome
PDF is a better resolution
PNG resolution is still good
- CAM_Control_PN_501337_DWG.png (588.03 KiB) Viewed 2563 times
Re: 501337 CAM - Control, Shop Smith Mark VII
Posted: Sun Oct 20, 2024 6:33 pm
by jafpanda
1st shot at a 3D model
- IMG_6733.jpeg (88.57 KiB) Viewed 2554 times
CAM_Control_PN_501337_DWG.pdf