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Looking to replace the tailstock (Proxxon PD400), need something more rigid

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Lester:
Hi folks

Thanks for your suggestions ... actually, I really am looking to replace the tailstock (smile), would love to know of any possibilities!

Hi DavidA,

> is the whole tailstock moving or is it the tailstock quill?

The quill is certainly wobbling in time with the drill bit, and the tailstock is showing some of that movement which is imperceptible by the time it gets to the bed which is pretty rigid.

> Also, does it do this if you drill up to 10 mm incrementally?

Sure, no problem if I drill 3, 6, 8, 9, 10.  But life is too short!  OK, I don't just want to drill 10 from a centre punch, happy to do 6 first;  but it will wobble when the quill has travelled 25 mm in this case in aluminium.

> I'm assuming it isn't something silly like a bent drill.

Nah, nothing silly!

Hi howsitwork?,

> stub drills

I run a stub 6 mm when I need to just drill a short damn hole immediately, but anything longer requires the 3, 6, 8, 9, 10 sequence.

> piloting it

I use a centre drill routinely, and then run the 3, 6, 8, 9, 10 sequence.

Hi chipenter,

> have you tried a new drill

Yes, my drills are sharp and new every year or so or when I notice any performance degradation.

Hi gerritv

> tailstock accurately aligned with the spindle

Now that is one of the issues with the tailstock, there is absolutely no way to adjust alignment.  Fortunately, it is acceptably good, but I would prefer to get it spot-on.  Hence, I really am looking to replace the tailstock.

Joules:
Could you bore and sleeve the tailstock in an attempt to get it true to the lathe bore.   Otherwise you are probably looking at fabricating something.   Again not the end of the world as your head will be doing the boring so it should all be inline, at least to the error in the headstock   :lol:

DavidA:
Have you tried putting a true bar in the lathe tail stock (Mt 2 ?) and clocking the run out with a dial indicator mounted on the cross slide ?

I know you did say that your tail stock run out was 'Fortunately, it is acceptably good,', But what is it ?

There seems to be something fundamentally wrong here. Tailstocks generally don't give trouble. Particularly Swiss made ones.

Dave.

DavidA:
Joules,

I like the boring option.
Carefully set up the fixed steady on the far side of the tail stock and insert boring bar. Or set up a dummy tailstock.

Dave.

diagnosticated:
I have a Japanese  Toyo lathe which people say Proxxon copied.  The tailstock is rock solid but I would say it was never designed to hold a drill bit as big as 10mm.   The tail stock chuck on the Toyo is 0-10 mm but I think that is optimistic. 

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