Member postings for David Noble

I've sent you a pm Paul

David

Morning Paul,

I'm just coming to the end of the same project. I'm happy to help if I can.

Here is where I'm up to.

David

I know you said they are not guitar related, but they do look like these.

David

Thanks for that David, I've bought a sheet of black acetal and made a 30 tooth and a 75 tooth gear as I wanted to cut a 10 tpi thread.They seem be performing well atm.

Many thanks, David

I didnt know about linear pots, I'll have a look, Thank You.

Thank you Robert, The unit is a bought in device as a bolt-on addition to my mill so I didn't get a manual for the driver.

Thank you Les, Whoa!!! as you may have deduced my skill set is not in electronics.

David

That's exactly what I needed to know, Thank you Rob.

I have a stepper motor driving the X axis on my mill. The speed is adjusted with a potentiometer. All of the adjustment that I use is located on the first quarter of the dial. Is it possible to use a different pot’ which will give me more accurate control over that first quarter?

Many thanks, David

I hadn’t thought of Nylon/Acetol/Oilon great ideas, thank you.

David

Thanks Bazyle,

As you can see there seems to be quite a number needed as I only have 4 or 5.
maybe my best option is to buy a sheet of 8mm aluminium and make them.

David

Thanks everyone, I was prepared to modify the gears if they were from another make but more details are:-

16D.P. 14.5 deg p.a. 3/8" wide, 3/4" bore, 5/32" keyway.

I was hoping to buy these second hand as there are quite a lot that are missing and to buy new is looking quite pricey.

David

Edited By David Noble on 03/02/2023 12:45:52

I would like to buy some change wheels for the Mellor lathe that I am attempting to restore. As the Mellor lathe seems to be fairly rare, they are not immediately available, so, as a last resort I could make them but I wondered if anyone knew if there is another lathe with the same tooth form of 16D.P.

Many Thanks, David

That was very funny 😁

Ah, ok. I was thinking that if the taper was split, it would grip the spindle as well as the gear wheel. Otherwise the gear has to drive through the thread.

David

Thank you both

Split taper! That is the piece of the jigsaw that was missing.

David

Sorry, I feel I'm pestering you guys lately!

The cross slide on the Mellor lathe I am restoring has what seems to me, to be a strange drive system.

There is an internal taper on the drive gear

The rest of it is missing. If I remove the gear it looks like this.

So, I made a taper to fit the gear and screw onto to the cross slide shaft

This works a treat. However, when it is engaged, the drive gear tightens it onto the feed shaft so much that I need some serious leverage to undo it. There is certainly no chance of disengaging the feed while it's running.

I wondered if maybe some friction material between the internal and external tapers would help?

Many Thanks, David

Of course, damaged screws. Simple( when it's pointed out )

Thank you, David

This is the tool post on the Mellor lathe I am restoring. The four corners have been opened out to 3/8” from 5/16” I can’t see it being like that from new, so I wondered why it might have been modified.

All the above are really helpful.

Thank you, David

Thank you for the replies and the ideas.
I’m afraid that I might not have been clear with my request. The chuck is not on the machine at the moment. My request was how to stop it happening in the future.

Many Thanks David

No apologies for the rhyming title!

As some of you know, I have been repairing a broken back gear on a Mellor lathe that I am restoring. After looking at the evidence, I think the damage has been caused by locking the back gear to remove a stubborn chuck.

I haven't used a lathe with a back gear and threaded chuck before so my question is, is there an accepted way removing a tight threaded chuck or alternatively, stopping it locking in the first place?

Many Thanks, David