1946 Model C leadscrew float

Can anyone tell me is there anything missing (a component) from the leadscrew in the photographs, and if so what does it look like or what is its name ? There is about 4 mm of float. Perhaps there should be some sort of collar riding on the leadscrew between the end of the thread and the leadscrew clamp. I suspect the leadscrew has been removed and perhaps replaced by a previous owner, since there is screwdriver damage to the slots in the heads of both the machine screws holding the leadscrew clamp at the headstock. Possibly if the leadscrew was removed and or replaced, when it was re-assembled the missing component / collar was omitted ?

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Hi,

The RH bracket looks fine, for the 9" models this does nothing but support the leadscrew.

The LH bracket also looks fine, there is a larger diameter bush that is pinned to the leadscrew that sits against the RH side of the LH bush.

I think the problem is actually on the LH end of the LH bracket.

From memory on that end of the leadscrew there should be a collar that eliminates the space between the end of the bracket and gear that is mounted on the leadscrew (even if that isn't the case, that is probably the quickest and simplest way to eliminate the issue).

Quote:

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Originally Posted by rickw72

Hi,

The RH bracket looks fine, for the 9" models this does nothing but support the leadscrew.

The LH bracket also looks fine, there is a larger diameter bush that is pinned to the leadscrew that sits against the RH side of the LH bush.

I think the problem is actually on the LH end of the LH bracket.

From memory on that end of the leadscrew there should be a collar that eliminates the space between the end of the bracket and gear that is mounted on the leadscrew (even if that isn't the case, that is probably the quickest and simplest way to eliminate the issue).

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Thanks, I had not considered the LH end of the LH bracket at all (other than to see that it needs to be aligned with the rest of the gear train correctly) when I get home to the lathe I will look at it again,

Donald

Okay, it's my fault, when a change gear is removed from the leadscrew you end up with the float, putting the change gear back on the leadscrew removes (most of) the float. A bronze shim or similar might deal with this residual float.

Donald