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Member postings for Arckivio Funiciello

Here is a list of all the postings Arckivio Funiciello has made in our forums. Click on a thread name to jump to the thread.

Thread: 4 jaw chucks
05/08/2019 11:33:27
Posted by larry phelan 1 on 05/08/2019 11:11:40:

Do the lathe makers not supply a 4 jaw chuck with the machine, or even as an extra?

Also, what happens when you need a faceplate ?

They do a 4 jaw chuck but I never ordered and I've actually been looking for a faceplate but can't seem to find one with the same pcs as a standard 3 jaw chuck. A 3 jaw 160mm chuck like the one supplied has a 145mm PCD

04/08/2019 22:35:22

I finally made my own backplate for a 4 jaw chuck. Used cast iron & went OK once I realised I was turning it at the nearly twice the correct speed! Came out really accurate & my lathe performed brilliantly. Thanks for all the advice everyone

09/06/2019 22:31:07
Posted by JohnF on 09/06/2019 22:20:30:

Arckivio, have a look at this link for information on the D1--3 spindle that's used on the Emco super 11 lathe, if yours is the same spindle it will be useful **LINK**

John

I had a look at the D1-3 earlier & for a 160mm chuck I think the recess is 125 & the PCD is 140 so 5mm out. I'm going to go with front mount 4 jaw chuck & make a backplate to suit but thanks for the link. Never seen a magnetic chuck on a lathe as he shows in the pics!

09/06/2019 21:21:02

While searching for other chucks I found a pic of the back of the chuck I was originally going to buy. Same register & PCD as my chuck mandrel so all perfect apart from the 4 bl**dy holes!ch160r.jpg

09/06/2019 20:37:08
Posted by JasonB on 09/06/2019 20:34:06:

About 15mm.

What size are the bolts, 1.5 x D should be OK

The bolts in my chuck mandrel are M8, not sure what the 4 jaw will have as I haven't bought it yet. Thanks for the reply

09/06/2019 20:32:27

Any advice on backplate thickness? I know it has to take the 4 bolts to hold the 4 jaw so it can't be too thin. I reckon an inch might be too thin?

09/06/2019 14:48:29
Posted by JasonB on 09/06/2019 14:44:27:

And this is how close the four fixings of a 160mm lightweight 4-jaw chuck come to the 3 flange studs on my lathe, had they been counterbored holes like Dave's they would have clashed.

20190609_122210[1].jpg

The PCD of my chuck mandrel is 145mm I think so at least that isn't a problem I'll have.

09/06/2019 13:27:00

It's not lack of a pillar drill, it's of experience on a bigger lathe doing bigger things. I've gone from a mini lathe to something quite a bit bigger! Looks like a back plate should be my first big project. I found a seller doing 160mm diameter cast iron by the inch.

09/06/2019 12:55:29
Posted by GordonH on 09/06/2019 12:42:16:

Arckivio,

Google d1-3 flange dimensions, they are very similar. My Myford has a BS4224 fitting, 3 mounting studs. It takes D1-3 chucks with the camlock fittings replaced by threaded studs. I bought these years ago from the old Myford in Nottingham.

GordoH

I'll look into that fixing too before I do, or buy anything. Thanks for all the replies everyone. Lots to think about and look into.

09/06/2019 12:11:19
Posted by SillyOldDuffer on 09/06/2019 11:57:26:
Posted by Arckivio Funiciello on 09/06/2019 10:14:49:

Posted by Peter G. Shaw on 09/06/2019 10:08:00:

...

... Use one of the holes already in the 4 jaw and then drill and tap another 2. In my little head it's a brilliant idea frown

I've wondered why bolt-on 3-jaw chucks have 3 bolts and 4-jaw types always have four. I think it's probably done to maintain balance and reduce torsional stress inside the chuck as it rotates. Turning forces are generated inside the chuck by the weight of the chuck body as it spins. If only 3 fixing points are used the forces may be unbalanced by spinning and also by unequal cutting forces via one of the jaws. I've not attempted to work out how big the forces are, but potentially quite big - trying to stop a freewheeling chuck by hand hurts.

If you try a three bolt fixing system can you report back what happens. Three possibilities:

  • Works with no adverse effects (hurrah!)
  • Works but finish affected by vibration (Might be acceptable)
  • The chuck might burst at high-speed. (Tears before bedtime.)

Dave

Edited By SillyOldDuffer on 09/06/2019 12:00:40

There's always one sad. I understand what you mean by the imbalance and I certainly hadn't thought of that! Wouldn't filling the holes left over with some threaded studding counteract the imbalance created by my new holes? If you're talking about creating an actual weakness, then I know studding wouldn't work and no amount of threadlocking the studs would stop the tears before bedtime!

09/06/2019 10:14:49
Posted by Peter G. Shaw on 09/06/2019 10:08:00:

For what it's worth, my lathe has a 160mm 4 jaw chuck which uses a backplate with a three hole fixing onto the mandrel.

Actually, it's worse than that as the mandrel has a set of 6 tapped holes in it onto which is bolted a chuck adaptor plate. This plate has three holes which allow for a three hole fixing 3 jaw to be directly attached to it. The 4 jaw chuck then uses a 4 hole to 3 hole back plate between the chuck and the adaptor plate. Seems to work ok. And, many years ago, I made an aluminium backplate to enable me to use an 80mm 4 jaw chuck.

Peter G. Shaw

That sounds way beyond me. I think I'm going to take the lazy, but expensive way out. A normal 4 jaw independent chuck is 70 quid, but one with a 130mm register that matches my lathe is 130 quid. Use one of the holes already in the 4 jaw and then drill and tap another 2. In my little head it's a brilliant idea frown

07/06/2019 07:43:15

Thanks for the replies everyone. I was trying to avoid the backplate route but looks like the chuck I want doesn't exist. I have seen backplate blanks so might be easier to start with one of those.

06/06/2019 23:33:32
Posted by JohnF on 06/06/2019 23:29:04:
Posted by Arckivio Funiciello on 06/06/2019 22:59:34:
Posted by JohnF on 06/06/2019 22:53:23:

Hello Arckivio, some more information would be useful, what make is your new lathe, what type if fitting is the spindle, screw on, DIN taper or ???

John

It's a CQ9332A. The chuck mount is a 130mm recess with 3 bolts on, I think a 145mm PCD. Thanks

From this I assume the machine spindle has a 130mm register and the chuck backplate has a 130mm recess to mate with this and 3 studs on a 145mm PCD passing through the machine spindle fixing holes ?

Yes the spindle has the register, 130mm. The 3 jaw chuck doesn't have a backplate as it already has the matching recess. No studs, the chuck bolts through holes in the spindle. Like I said, I can find a 4 jaw chuck with the recess but has 4 holes.

06/06/2019 23:22:16

If they had a 6" chuck I'd try & order from them. If I got the 4 jaw with the 130mm recess, would it be possible to mark & drill 3 mounting holes?

06/06/2019 23:14:02
Posted by Michael Gilligan on 06/06/2019 23:07:58:

Arckivio

It would be most unusual to find a four-jaw chuck with three fixing holes

I think this illustration might help identify what you need: **LINK**

http://www.boltontools.net/index.php?route=product/product&product_id=2117

MichaelG.

Ha. I never came across that because I searched UK only on Google. Even just the backing plate would do me. I also never searched specifically for the code number of my lathe. Don't want to use the brand name . Thanksas this forum has advertisers and they are not one of them lol. Thanks

06/06/2019 22:59:34
Posted by JohnF on 06/06/2019 22:53:23:

Hello Arckivio, some more information would be useful, what make is your new lathe, what type if fitting is the spindle, screw on, DIN taper or ???

John

It's a CQ9332A. The chuck mount is a 130mm recess with 3 bolts on, I think a 145mm PCD. Thanks

06/06/2019 21:55:05

Hello all. Having got rid of the mini lathe that blew it's motor, I went mad and bought a rather large lathe from Italy. Lathe seems great & pretty accurate for the money. My problem is I want to add a 160mm 4 jaw independent chuck but don't think I'm at the skill level to make my own backplate. All the chucks I can find are either front mounting, or have the 130mm recess I need but have 4 mounting bolts & not 3. Is there a specific chuck I need to look for, or is there an easy way to mount the 130mm recess chucks, like drilling 3 new mounting holes & not using the 4? Cheers

Thread: Mini lathe
26/03/2019 23:34:25

No, only those next to each other. It's actually quite difficult to check those opposite each other as there's so many. I'll try that tomorrow night & I'll start earlier when I'm not so sleepy! I'm sure it will be the 2 dodgy ones I found tonight that wont measure correctly with those opposite.

Thread: Low rate automatic house plant watering system
26/03/2019 23:11:52

I don't even have a garden but I could use some of these ideas for my indoor bonsai's as watering 20 trees every 3 days is proper pain! Capillary matting sounds good.

Thread: Mini lathe
26/03/2019 22:29:40

Test results are in! There is no continuity between commutator bars & the motor housing. Impedance between each bar & the one next to it is between 1.4 to 1.6 ohms, apart from 2 where it is 6.3 ohms. Not sure if this means there is a short circuit or if it's open circuit or if it's the cause of the issue with this motor. Hopefully someone will know....Thanks for the help so far

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