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Old 01-11-2011, 01:47 PM
gpartin gpartin is offline
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Default Mark VII Cam speed control

Hey all, I am going to a plastics molding company tomorrow mornibng to see about getting a cam speed control mold made for the Mark VII

I know it is going to be costly but just thought I would check it out and I am curious as to what the demand might be for this replacement part?

I am sitting on 3 Mark VIIs myself with only one good cam, anyone that may be interest please let me know what you think, I have had the part at a machin e sho[p for weeks and they recommended going this route as I have heard Aluminum parts would warp and there is just too much machining involved after the mold

Also I have the original part but if someone has actual specs on it that would be great ...thanks ..Glen
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Old 01-11-2011, 04:07 PM
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beeg beeg is offline
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Your best bet about the interet might be on ebay.
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Old 01-11-2011, 07:22 PM
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chucks chucks is offline
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If I can find a Mark VII, I'd be interested! (As long as the Wife lets me add to my 4 Mark V's)
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Old 01-24-2011, 11:07 PM
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wannabewoodworker wannabewoodworker is offline
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G,
You and I have been down the same road and have corresponded I believe on this. I still have not heard back from my machinist and it has been almost a year??? Go figure?? I have even been looking at mini cnc mills for myself at home as they could do the dirty work of making the cam follower. The problem is I have no idea how to go about inputting all the information necessary to program the CNC to cut the cam. But the journey would be fun. Let me know if you have any luck finding a company to make the part for you. I never really considered the plastics company idea as I always felt that getting one made out of something more durable was the way to go but if they could be produced from plastic then just buying a bunch of them would suffice I guess.
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Old 05-08-2012, 09:41 AM
briallpro briallpro is offline
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Default Mark VII can

Anyone ever have any sucess sourcing the Mark VII speed cam? My early 1960's Mark VII is still functioning but running it for 30 seconds at at at time with a half hour cooling off period is getting old...
Brian

Quote:
Originally Posted by gpartin
Hey all, I am going to a plastics molding company tomorrow mornibng to see about getting a cam speed control mold made for the Mark VII

I know it is going to be costly but just thought I would check it out and I am curious as to what the demand might be for this replacement part?

I am sitting on 3 Mark VIIs myself with only one good cam, anyone that may be interest please let me know what you think, I have had the part at a machin e sho[p for weeks and they recommended going this route as I have heard Aluminum parts would warp and there is just too much machining involved after the mold

Also I have the original part but if someone has actual specs on it that would be great ...thanks ..Glen
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Old 05-08-2012, 11:10 AM
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letterk letterk is offline
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There was an individual who visited here. I believe he had it machined out of aluminum. His username is "hdoilcan".


Here was his post on shopsmith users group

http://www.ssug.org/index.php/forum/...um-cams-4-sale

On a side note, isn't the function of this part to basically pull/close the sheaves. One would wonder if you could rig up something like a mini hoist, maybe a fishing reel to do that. I supposed it would have to be really strong line or is there more to this part.
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Old 05-08-2012, 01:02 PM
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JPG40504 JPG40504 is offline
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Quote:
Originally Posted by briallpro
Anyone ever have any sucess sourcing the Mark VII speed cam? My early 1960's Mark VII is still functioning but running it for 30 seconds at at at time with a half hour cooling off period is getting old...
Brian

Yes hdoilcan did indeed get some made out of aluminum, and an excellent job was done.

He had a few 'extras'(only he and I put money up front) made and was intending to sell them(they ain't cheap, but are a solution, and a permanent one at that!).

I do not know what the status of that is.

http://www.shopsmith.net/forums/showthread.htm?t=9912


However a greater question is why does 1/2 hr cause 'overheating'? Is the cam follower getting hot, the motor, or the entire headstock? is the idler shaft well lubricated? Is the follower bearing well lubricated? Are the motor bearings ok?
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Last edited by JPG40504 : 05-08-2012 at 01:07 PM.
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Old 05-08-2012, 01:06 PM
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beeg beeg is offline
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Quote:
Originally Posted by JPG40504
However a greater question is why does 1/2 hr cause 'overheating'?


The 1/2 hr is the COOLING OFF period, after running it for 30 SECONDS.
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Bob
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Old 05-08-2012, 01:10 PM
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JPG40504 JPG40504 is offline
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Quote:
Originally Posted by beeg
The 1/2 hr is the COOLING OFF period, after running it for 30 SECONDS.

Seems the question is much 'greater' that I realized.
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Old 05-08-2012, 05:20 PM
gchapman gchapman is offline
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This really sounds like the bearing on the end of the cam follower is bad. I have the same issue with mine and have not had time to tear it down and get part numbers for a replacement bearing.
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