Clausing/Colchester 11" (Colchester Bantam 2000)

[Badge171]

Clem
Cheeseking put some detailed plans up for me on the follow rest , There posted in another thread in this column. and some pictures of the one I made. His plans include pictures of the original equipment . Hope it helps
Frank

 

[Cheeseking]

Gregor, it sounds like your tailstock could be slightly offset.
After I shot this video I re-checked sweeping the inside of the MT on the barrel vs the OD. This is my rough hary eyeball method of checking.

I believe the "real" way to check is traversing with an indicator along a ground bar mounted between centers. If you are turning unwanted tapers when only holding by the chuck then I think the issue is headstock alignment to the bed. Thats a whole nuther can of worms.

 

[wa5cab]

Turning a taper with the work piece held between centers or with chuck or collet and tailstock center is usually an indication of tailstock back set error. Turning a taper with work piece held in chuck or collet may be an indication of a twisted bed or a worn bed.

 

[Badge171]

Isn't it possible with that machine that the headstock is out of alignment, It is adjustable . Rather than the bed being twisted ,or worn. Just a thought.

 

[wa5cab]

Yes. However, unless it has had a bad crash or been dropped on the headstock, I would guess it is the least likely as headstocks are generally a tight fit between the ways and if there is an alignment problem, it would have almost had to have been that way since new.

 

[sakurama]

Yes, it was the tailstock that was out of alignment. I managed to adjust it so that the error over 11" is just under .001" which I don't know if I want to try to spend the time to try to improve. I don't know if I was doing it wrong to start but I was turning in the screw on the back side of the tailstock (loosening the one on the front) and the taper got worse so I went backwards to what I thought was the right way to adjust it and screwed in the adjustment screw on the front side and the taper went away and I got it to be basically on. Perhaps you guys are more patient than I am or more particular but I can't see trying to improve on .001" over 11".

Thanks for the advice - it's good know I could turn an axle now if need be.

Gregor

Gregor,

I would check your tail stock alignment. It is probably adjusted a bit off toward the chip pan. You should be able to adjust it by doing that same cut you are doing or use a test bar between centers.

Colin

 

[wa5cab]

Gregor,

0.001" per foot is pretty good. If it is good enough for the parts that you want to make with it, I wouldn't fiddle with it any more.

I took "tighter near the headstock" to mean larger. Which meant that the tailstock was too far forward (toward the operator). I wasn't sure what Colin meant by "off toward the chip pan". My chip pan is symmetrical. But in any case, you figured out which direction to move the tailstock.

 

[Kiwi]

The common name for the rest that is attached to and moves with the carriage is Follow Rest or Follower Rest.

I've always known them as a fixed or floating steady either way you would know

 

[Clem]

I've always known them as a fixed or floating steady either way you would know

I've always known them as a fixed steady and a travelling steady! As long as they do the job!

 

[badboydas]

Hi Guys
Sorry to jump in here, just bought one these beauties in a sorry state. Being delivered tomorrow, Don`t suppose anyone has a manual in PDF they would be willing to mail me or post a link to. attached a picture of it in its present location, as you can see it needs a lot of attention.
cheers
Sorry just found the manual in the downloads section cheers