Chuck compatibility with mini lathe

[andrew lynerParticipant @andrewlyner71257]

I need a four jaw chuck for my Warco Supermini Lathe. Warco’s (plug and play) chucks are on back order and I would like not to wait. Chronos tell me that I need the right back plate for theirs and this seems to be a general prob. I would prefer not to rely on my present skills to produce a back plate myself.

Is there a source of plates that would know what I need?

[andrew lynerParticipant @andrewlyner71257]

[John RuddParticipant @johnrudd16576]

Have you tried Chester machine tools, Tony is usually very good at being helpful.

However it is usual to 'fit' the plate to the chuck to ensure an accurate assembly…This involves machining the spigot on the front of the plate to match the recess on the chuck…

Edited By John Rudd on 26/09/2018 13:03:51

[JasonBModerator @jasonb]

I could be wrong but have a feeling the Warco chuck fits straight onto the lathe's flanged spindle and that is why they sell a different chuck for the new "super" version to the old run of the mill minilates.

Thelarger 100mm chuck of the "super" already puts more load on the machine, if you add a backplate that will just increase the issue as well as loosing you 10-12mm off the already quite short ctr to ctr distance.

Edited By JasonB on 26/09/2018 13:21:54

[Ron LadenParticipant @ronladen17547]

Andrew, as mentioned before my CJ18a lathe looks to be pretty much identical to your Warco Supermini.

My machine doesnt need backplates to fit the chucks, they fit straight onto the spindle flange as Jason mentioned. I would be pretty sure that your machine will be the same. I havnt yet got myself a 4 jaw but if you look at the spindle flange there is additional mounting holes as well as the 3 holes for the 3 jaw chuck. I think I,m right in saying that the 4 jaw is mounted using 4 holes, one of which is used to mount the 3 jaw with the other 3 spaced accordingly.

I got my machine from Amadeal and they do a 100mm 4 jaw independent chuck for £73. I was speaking with them a few minutes ago about something else and I asked if their chuck will fit the Warco Supermini. The guy I spoke with thinks it will but he wouldnt swear on it, he suggested measuring the set of 4 mounting holes and also the spindle flange diameter.

Should you be interested, their number is 020 8558 4615.

Hope this may help.

Cheers

Ron

[John RuddParticipant @johnrudd16576]

Ooops, my mistake…

I think my head was somewhere else…

Yes the chucks on many of these mini lathes are just bolted straight onto the spindle flange…usually 80mm in diameter (My Sieg is no exception…).

Andrew if your lathe chuck is 100mm, then you could even try ArcEurotrade for a 4 jaw chuck (Warco do state the 3 jaw is 100mm) and no backplate is required…(I think this is where Chronos may have been confused, the earlier 80 lathes needed an adaptor plate to accomodate a 100mm chuck )

Edited By John Rudd on 26/09/2018 14:46:44

[JasonBModerator @jasonb]

The Amadel is not brushless so more like the old Warco Mini-lathe so unlikely theirs will fit the "Super" either. Also Warco list a different 4-jaw for the Super than their standard 72mm recess 4-jaws and Amadeal say their mini has a 72mm spindle register.

Really need to know the details of teh Super's spindle flange

It does not say they are OS on the Warco site just almost OS so there may be one kicking about in the store room

 

Edited By JasonB on 26/09/2018 15:20:37

[John RuddParticipant @johnrudd16576]

OK, my minilathe is the Sieg offering (supplied by Arc..) and has an 80 mm flange….

I have both 3 and 4 jaw chucks for it and an ER32 collet chuck…

I use the originally supplied 3 jaw and a Chester supplied 4 jaw self centreing chuck…

So there are alternative sources to Warco…even though their machine is 100mm flange diameter.

Bottom line here is there are two things to check…

1) the number of bolts, 3 or 4 and their diameter (Usually 6mm) and pcd

2) the recess diameter of the chuck, obviously needs to be the same as the register on the spindle flange

[andrew lynerParticipant @andrewlyner71257]

I pulled off the three jaw chuck and found that there is no back plate. The flange on the spindle is 100mm and the recess is 72mm which is the same as for a number of 100mm chucks and there are four holes on the flange to fit the studding holes on those chucks. (Cooh – you can spend a lot of money an a good chuck, can't you!)

I don't know why I didn't have a proper look at the start. It's not always a bad thing to be timid about some things though.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by andrew lyner on 26/09/2018 23:36:48:

I pulled off the three jaw chuck and found that there is no back plate. The flange on the spindle is 100mm and the recess is 72mm which is the same as for a number of 100mm chucks and there are four holes on the flange to fit the studding holes on those chucks.

.

I was about to get all clever and say something like "well it is made to a DIN Standard, you know" …

BUT it's not

A quick look here: **LINK**

http://katalog.hhw.de/EN/26_HHW_Katalog_2010_eng.pdf

indicates that 100mm DIN 6350 chucks have a 70mm recess, not 72mm.

Ho, Hum … so much for standards.

MichaelG.

[not done it yetParticipant @notdoneityet]

No real problem with standards – as long as you stick to one.

Imperial and metric measurements are one obvious example. That is just one example where a single standard which, to this day, has not yet been universally accepted.

[JasonBModerator @jasonb]

Andrew, what is the PCD of the 4 fixing holes as Warco do other 4-jaw chucks with a 72mm recess but they don't list them for the Super, maybe a different PCD to other chucks with 72mm recess.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by not done it yet on 27/09/2018 05:57:50:

No real problem with standards – as long as you stick to one.

.

So [for my education]; is there actually a standard that specifies a 72mm recess for 100mm chucks ?

MichaelG.

[andrew lynerParticipant @andrewlyner71257]

Posted by JasonB on 27/09/2018 07:13:24:

Andrew, what is the PCD of the 4 fixing holes as Warco do other 4-jaw chucks with a 72mm recess but they don't list them for the Super, maybe a different PCD to other chucks with 72mm recess.

There is that information about the three jaw chuck on the Warco site and they say / imply that the 4 jaw is the same (the seven holes on my flange lie on the same circle) so I think I am OK. If the one I end up ordering is no good, I shall just have to return it, I guess.
The holes (9mm) are quite sloppy around the studs there is wiggle room by design, it seems.

The 70 / 72 mm thing sounds daft. I guess it could be to do with the Imperial influence on the design of some lathes / chucks.

Edited By andrew lyner on 27/09/2018 09:48:39

[not done it yetParticipant @notdoneityet]

Nah! More likely a ruse by some suppliers to avoid other chucks being used on their machine. Captive market – at least at that time.

[Niels AbildgaardParticipant @nielsabildgaard33719]

A link with dimensions:.

**LINK**

Edited By Niels Abildgaard on 27/09/2018 10:47:52

[Stuart Smith 5Participant @stuartsmith5]

I have a CJ18A mini lathe from Amadeal. I bought a 4 jaw chuck from Amadeal at the same time as the lathe.

I have just measured the recess and it is 71.86 mm with a PCD of 83.6 mm. The 4 fixings are M8 tapped holes in the chuck. I suspect that the spec is actually 72mm and 84mm.

As Ron Laden has already said, my lathe looks the same as the Warco Supermini lathe.

Stuart

[Ron LadenParticipant @ronladen17547]

The Warco Supermini is brushless of course where as the CJ18A is a brushed motor, but other than that I think they are pretty much the same machine with the same dimensions.

As Stuart as mentioned in round figures the recess is 72mm and the fixing PCD is 84mm, so Andrew if your spindle flange PCD is 84mm then the Amadeal chuck will fit as will a number of others of course.

Ron

[andrew lynerParticipant @andrewlyner71257]

Let's just hope. I won't believe it until it's actually bolted in place. Despite a lifetime of Engineering and Physics, there's still something in me that only accepts that measurements are actually right when the part fits or the light actually comes on when the switch is pressed.

I appreciate the sympathy that I have detected in all these posts and I realise this sort of thing must happen for most of us in one form or another.

Andrew

PS Does anyone else have the problem that I do with the return key on my keyboard? Return takes me to the top of the page. I need to do Cntr Return to move down a line. I have not come across this problem before. Is it some Apple / Windows thing?

[mechman48Participant @mechman48]

… PS Does anyone else have the problem that I do with the return key on my keyboard? Return takes me to the top of the page. I need to do Ctrl Return to move down a line…

I have the same problem on this site, not with any other site… ?. I also have to press Ctrl or shift together with return key to move down a line space or two when I want to insert new paragraph or pic

George.

[Neil WyattModerator @neilwyatt]

Posted by andrew lyner on 28/09/2018 10:09:24:

Is it some Apple / Windows thing?

It's some weird Apple thing.

No-one knows what or why…

Neil

[andrew lynerParticipant @andrewlyner71257]

Posted by Neil Wyatt on 28/09/2018 12:40:03:

Posted by andrew lyner on 28/09/2018 10:09:24:

Is it some Apple / Windows thing?

It's some weird Apple thing.

No-one knows what or why…

Neil

The Webmaster could sort it, I"m sure.

Also the 'like' facility is good. You don't have to write a whole post in order to agree with someone. Go on – tell me there's a button somewhere.

[Neil WyattModerator @neilwyatt]

Posted by andrew lyner on 28/09/2018 18:25:27:

The Webmaster could sort it, I"m sure.

I doubt it.

These are aspects of the editor used, not the way we have it set up, unfortunately.

Neil

[SamsarandaParticipant @samsaranda]

I have the same problem with the return key on an IPad but only when used on this site. I just live with it but does catch me out sometimes..

Dave W

[Harry WilkesParticipant @harrywilkes58467]

Not limited to Apple I have the same problem on my windows laptop

H

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