Linear Bearings provide any rotation or purely linear?

Gallery, Projects and General > How do I??

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raynerd:
Just re-read it... are you trying to say as others have already suggested to me, just run it without bearings. To be honest, this was my original plan which is why someone kindly sent me the cast iron blocks.

Chris

Fergus OMore:

Chris,
I'm not JUST saying run it without bearings but questioning why you are going to use a hardened spindle.

I have a couple of DH's etc -without bearings. No problems.
However, I questioned why you wanted a hardened spindle. My stuff follows a pattern of creative thought( not me but the designers)
My Vertex came with a blank face plate and a three jaw chuck that had a Myford thread( which is suitable for me) but it came with a decent through bore and a No2 MT bore. So I can:-
1. Fit Myford collets( Imperial)
2. Fit a No2 MT boring head, which bores but also does ball handles
3. Fit ER25 collets ( Metric really)
4. The Myford nose takes all the Myford goodies
5. The ER25's take my end mills and slot drills-- but go on the Clarkson for re-grinding

Re=grinding? Well, the Vertex also 'tips' into a 90 degree plane to act as a rotary table but does the 3 and 15 degree lands
Miner and I were prattling about 4 facet grinding as well.

Ok, it is getting a wee bit heady but the division plates on the George Thomas go onto the Myford headstock.
And of course, I have the micro adjustment to do damned near anything with holes.

Enough , eh? Well, enough for a dizzy old fart who was kicked out of school at 14 without a qualification.

Cheers

F O'M

Lew_Merrick_PE:
Chris,

1) Most round shaft linear bearings will work as rotary bearings -- just not all that well. The balls won't circulate as they will for linear action which means that dirt becomes more problematic as does lubrication.

2) Why not just a bronze bushing for your dividing head? It isn't as if you have high speed rotation or loads that will exceed the compressive strength of bronze. In point of fact, a longitudinal (internal, not reaching the ends) groove (something that can be freehanded with a rotary cutting tool) can act to distribute lubrication to your pivot axis. The advantage of this is that the wear will take place in the (replaceable) bushing.

???

Pete.:
My dividing head is just a plain old shaft running on cast iron. I don't know how old it is but I'd guess at least 40 years. Has a pinch bolt to hold it once it's set.

DaveH:
Chris,
It says ball bearing so it will be fine for what you want.

I really don't see why I should answer your question when it ships "world wide" except South Africa :lol: :lol: :lol:

When you buy it ask the miserable bar steward why not to South Africa :lol: :lol: :lol:

Go for it Chris
:beer:
DaveH

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