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Lead screw gauge

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Mike 9016/12/2019 23:20:55
23 forum posts
4 photos

Hi all, I’m new to the site, and have just bought a Chester DB7, lathe my question is, the lead screw handle has a bracket that limits the travel, can the bracket be removed and will the gauge still engage ok, I can’t really see it’s perpose anyway.

Tony Pratt 117/12/2019 06:56:47
2319 forum posts
13 photos

Do you mean the far RH bracket that is locating the leadscrew?

Tony

JasonB17/12/2019 07:02:17
avatar
25215 forum posts
3105 photos
1 articles

Sounds like the thread dial, yes you can just undo the long cap head screw that it pivots on and remove. Ideally put a small screw back in the hole so any swarf does not find it's way into the apron.

Mike 9017/12/2019 14:20:45
23 forum posts
4 photos

It’s the lever that engages the lead screw, there’s a small bracket with a notch, the warco 180 is the same as my Chester, apart from the bracket, I can’t see what the bracket does apart from making engagement aqward.

Journeyman17/12/2019 15:25:44
avatar
1257 forum posts
264 photos

I assume the bracket arrowed in the image below:

bracket.jpg

Seems to serve little purpose and looks quite crudely made. Could it be a shipping device?

John

Bill Davies 217/12/2019 16:41:28
357 forum posts
13 photos

Does it limit the amount of disengagement? Agree with John it seems pointless, unless the cams or slots opening and closing the half nuts (or is it a single half nut) are loosely toleranced.

Bill

not done it yet17/12/2019 16:58:11
7517 forum posts
20 photos

I would be aiming my question towards Chester Tools. They should know why it is different from other ‘virtually identical’ machines and the reason for that difference. I suspect there is a reason for it and it is not a shipping device.

I note there seems to be (several) differences between similar machines from individual suppliers - motor power and weight being others, at least.

Split Pin17/12/2019 17:34:04
13 forum posts
1 photos

The bracket is there to prevent accidental engagement of the lead/feed screw, I found that when it was it new it was a bit notchy, Pulling the sleeve handle up to clear the notch and getting clean engagement is a bit of a knack which develops over time. It helps if you move the saddle with the hand wheel at the same time,usually away from the chuck this help aligning the half nut with the thread on the lead screw.

Steve

Edited By Split Pin on 17/12/2019 17:37:31

Howard Lewis17/12/2019 21:01:56
7227 forum posts
21 photos

I wondered if the handle needs to be pulled out, to clear the bracket, so that it can turn to engage the half nuts.

This assumes that the bracket is there to ensure that the half nuts are not engaged accidentally.

Howard

Mike 9017/12/2019 23:08:43
23 forum posts
4 photos

Thanks for the answers all, Pulling The handle out and pushing down does release it a bit but when it’s released back in, the handle stops half out the half hole in the bracket, do you know if the handle is supposed drop out of the bracket completely, or is it just tight because it’s new, many thanks guys.

Hopper18/12/2019 05:43:36
avatar
7881 forum posts
397 photos

Sounds liek the halfnuts are riding on top of the leadscrew threads, stopping full handle movement. Are you doing this with the leadscrew rotating? It might take a second or two for the nuts to fully engage with the leadscrew threads. Or if not rotating, you might have to move the carriage along with the handwheel until the nuts drop into full engagement.

not done it yet18/12/2019 09:03:59
7517 forum posts
20 photos

Chester Machine Tools
Clwyd Close
Hawarden
CH5 3PZ
Tel: 01244 531631
E-Mail: [email protected]

© 2018 Chester Machine Tools

Mike 9019/12/2019 17:18:51
23 forum posts
4 photos

Thanks all , I have sent Chester an EMail , just waiting for reply, but have since found the gauge wasn’t fully engaging in the lead screw, stopping it turning properly, and all what was needed was fully tightening the Allen crew locating the gauge on the spindle, it was slightly loose so when moving the handle down it wasn’t engaging in the thread properly, Many thanks again.

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