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Clarke CL500M half nut conversion

Just made a half nut conversion for the Clarke CL430 or 500 lathe

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Stuart Cox 322/04/2021 22:39:18
152 forum posts
25 photos

Just thought I'd let any Clarke 430 or 500 lathe owners know about my half nut conversion I have just finished on my CL500M.

I've had the lathe for a few months now and its had lot of use in that time. I have been very pleased with the results I am getting from both the lathe and the mill. I have made a few mods so far, like converting the motor to a variable speed DC brushless motor and adding a reverse for the leadscrew to enable lefthand threading.

One issue I wanted to tackle since I got the machine is the lack of a half nut, which means the only way to move the carriage up and down the bed is by turning the feedscrew handle, which I find a slow and laborious job.

So I decided to make my own halfnut mechanism, which I made mostly using the lathe/mill and materials I had laying about.

Rather than explain how I went about it, here's a link to a YouTube video I made of the conversion. Hopefully it is OK to post this link but if it gets removed just search for Clarke CL500M half nut conversion on YouTube.

I am extremely pleased with the result and it makes sliding the carriage up and down the bed a breeze.

https://www.youtube.com/watch?v=kAKPhE9HisI&t=59s

I may add a rack and pinion gear at a later date although it operates fine without.

Hopefully this is helpful to someone else who fancies giving it a go!

Pete.22/04/2021 23:38:11
avatar
796 forum posts
235 photos

Do you have any photos you could post here of the half nut mechanism?

I'd be interested in seeing how you've solved your problem.

Stuart Cox 323/04/2021 07:23:53
152 forum posts
25 photos

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Stuart Cox 323/04/2021 07:24:43
152 forum posts
25 photos

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Stuart Cox 323/04/2021 07:26:27
152 forum posts
25 photos

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Stuart Cox 323/04/2021 07:28:00
152 forum posts
25 photos

...anyone know how to rotate a picture? Fir some reason when I upload them to an album it turns them upside down!??

john halfpenny23/04/2021 08:49:44
232 forum posts
24 photos

Well done Stuart. Have you made any drawings? - though it should be relatively easy to follow your video. This is something I have intended to do for some time as winding the lead screw is tedious, and it solves the only shortcoming I have not yet addressed. JH

Stuart Cox 323/04/2021 09:37:43
152 forum posts
25 photos
Posted by john halfpenny on 23/04/2021 08:49:44:

Well done Stuart. Have you made any drawings? - though it should be relatively easy to follow your video. This is something I have intended to do for some time as winding the lead screw is tedious, and it solves the only shortcoming I have not yet addressed. JH

Thanks John. I haven't made any drawings but I can probably take some measurements if you need them

john halfpenny23/04/2021 19:53:52
232 forum posts
24 photos

Hi Stuart, I intend to make this so some dimensions would help me scale and make a drawing. Perhaps block size and hole centre from top edge, and cam diameter would get me started. I think I can scale the rest to suit my material stock. PM me if you like. Many thanks. JH

Stuart Cox 323/04/2021 20:08:14
152 forum posts
25 photos
Posted by john halfpenny on 23/04/2021 19:53:52:

Hi Stuart, I intend to make this so some dimensions would help me scale and make a drawing. Perhaps block size and hole centre from top edge, and cam diameter would get me started. I think I can scale the rest to suit my material stock. PM me if you like. Many thanks. JH

I will take some measurements over the weekend and PM them to you John

Pete.23/04/2021 20:19:21
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796 forum posts
235 photos

Thanks Stuart, looks like it works well.

Danni Burns13/05/2021 11:30:01
63 forum posts
42 photos

Well done Stuart

I have just bought a CL500m and just getting used to it and not sure how everything works (or not) just yet.

I was a Turner (25 years ago on Colchester Triumph 2000 lathe) so I should be able to manage this, but this is the most annoying limitation I have found so far.

Would you please post more details, as I am definitely keen to do this.

Regards

Danni

mechman4814/05/2021 16:43:25
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2947 forum posts
468 photos

Your link...

https://www.youtube.com/watch?v=kAKPhE9HisI&t=59s

brings up ' No results found'

George.

Danni Burns14/05/2021 17:16:49
63 forum posts
42 photos

Mechman - the link works fine. Maybe cut/paste it into browser

Oldiron14/05/2021 17:27:51
963 forum posts
40 photos

Yes the link works ok when copy & pasted.

regards

Stuart Cox 314/05/2021 20:11:13
152 forum posts
25 photos
Posted by Danni Burns on 13/05/2021 11:30:01:

Well done Stuart

I have just bought a CL500m and just getting used to it and not sure how everything works (or not) just yet.

I was a Turner (25 years ago on Colchester Triumph 2000 lathe) so I should be able to manage this, but this is the most annoying limitation I have found so far.

Would you please post more details, as I am definitely keen to do this.

Regards

Danni

Thanks Danny

Let me know what info you need and I'll do my best to pm it to you. John Halfpenny ( another member on this forum) has just done the mod, so he might be able to chip in too! I've also added a hand wheel to quickly move the saddle up and down the bed, it's a bit more elegant than manually pushing it. I will post details of that mod once it's all finished.

Stu

Danni Burns14/05/2021 20:30:26
63 forum posts
42 photos

Thanks Stuart

John has been helpful already and shared the drawing and other advice.

I need to make a cutting-list and order all materials, as I'm starting from scratch, and buy a few tools before I can get going. Its not going to be a cheap mod.

Damn - Just realised I need a 4-jaw chuck as well.

Stuart Cox 314/05/2021 20:44:01
152 forum posts
25 photos

..... I got a 160mm 4 jaw independent chuck from Vevor uk and made a back plate to fit the Clarke. I think the chuck was £64 and the material for the back plate I think was £15, so not too expensive.

Glad John is helping you out with a drawing.

Stu

Danni Burns15/05/2021 13:18:47
63 forum posts
42 photos

Thanks Stu really helpful

That looks like the most cost (new) effective solution

I dont suppose you remember what size blank you used for back plate?

Cheers

Danni Burns15/05/2021 14:03:11
63 forum posts
42 photos

I hope it the right one: K72-160 160mm (6" 4 Jaw Metal Lathe Chuck Independent Jaws W Chuck Key

Could you confirm please Stu?

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