Author Topic: Record Power Chuck Jaw Alignment?  (Read 3640 times)

Offline Bill21

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Record Power Chuck Jaw Alignment?
« on: March 28, 2021, 11:50:06 PM »
I’m having a problem getting the pin jaws on my new Chuck to run concentrically. I normally wind the  accessory jaws in before finally tightening the screws but that didn’t work. I’ve also tried holding the accessory jaws as circularly as I can before tightening the retaining screws but that doesn’t work either. I’ve also tried swapping accessory jaws around in case they’ve been miss numbered. Tomorrow I’m going to check the standard 40mm jaws to see how they work out. Anyone else had this problem?
Just out of interest, and not that it would cause the problem but I put a DTI on the Chuck body itself whilst it’s on the spindle and it’s spot on. It’s a Record Power SC2.

Offline Twisted Trees

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Re: Record Power Chuck Jaw Alignment?
« Reply #1 on: March 29, 2021, 12:24:37 AM »
Put a known round object in them tighten them up (gently) then screw them down that is what I used to do with my patriot / nova setups
TT, AKA Pete, but that name is taken :-)

Offline Bill21

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Re: Record Power Chuck Jaw Alignment?
« Reply #2 on: March 29, 2021, 02:12:05 PM »
I’ve tried that already and still no joy. I’ve contacted Record Power and sent them a couple of pictures. I’m getting an error on the standard jaws as well so I checked the main jaws (no accessory jaws fitted) by clamping a piece of 10mm silver steel in them and I get a error of 0.06 - 0.22mm which is not too bad for a wood turning Chuck? I’m sure the error on the accessory jaws is much larger than this.

Offline Bill21

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Re: Record Power Chuck Jaw Alignment?
« Reply #3 on: March 29, 2021, 06:24:10 PM »
I’ve been wracking my brains trying to work out what the problem is with this Chuck and Jaws. It’s not too easy to take accurate measurements of certain aspects of the design without a suitable jig and possibly specialist measuring equipment so I gave up on that idea. As a result I’ve tried a couple of different options. I tried just fitting the inner fixing screws but on tightening they wanted to move the jaws off centre so to speak. I then tried fitting just the outer ones and it was marginally better. What I believe the problem is, in spite of the fact that the accessory jaws have a “register” (tenon) that mates with the Chuck jaws, is that the screw holes are in slightly the wrong place. As a result the accessory jaws are pulled off centre by the fixing screws.

A long time ago I noticed that Axminster chucks, at least the two SK100’s I’ve owned, use standard Cap Head Socket Screws to retain the accessory jaws. There are also over size counterbored holes in the accessory jaws. As a result the fixing screws don’t overly effect the position of the accessory jaws on the Chuck. Contrast this with some other makes that, for some reason use non standard Countersunk Screws in a fairly small countersunk hole. If, big if, the holes are always in exactly the right place then this should not be an issue.

It seems on my particular example either the M5 tapped holes in the Chuck jaws are slightly off or the holes in the accessory jaws are? I think I can fix this by using different screws and perhaps a little light fettling. It shouldn’t be necessary of course. Maybe I’ve just got a rogue example or maybe there are more out there like this?


Offline Sandy

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Re: Record Power Chuck Jaw Alignment?
« Reply #4 on: March 29, 2021, 11:06:38 PM »
Hi Bill

If I understand what you mean by "having a problem getting the pin jaws on my new Chuck to run concentrically" perhaps one (or more) of your pin jaws has 'spread' when you used them previously, tightened down on a piece in your chuck?

« Last Edit: March 29, 2021, 11:08:56 PM by Sandy »

Offline Bill21

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Re: Record Power Chuck Jaw Alignment?
« Reply #5 on: March 30, 2021, 10:27:12 AM »
It’s only ever been used once in expansion mode. Difficult to bend as well I would have thought. But no, it was like this when I got it.

« Last Edit: March 30, 2021, 10:29:03 AM by Bill21 »

Offline John D Smith

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Re: Record Power Chuck Jaw Alignment?
« Reply #6 on: March 30, 2021, 10:57:59 AM »

  Hi Bill,
           Looking at the photograph first have you got the jaws in the right positions second did you fit them in the correct order on to the scroll of the chuck.
                                   Regards John
John Smith

Offline Bill21

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Re: Record Power Chuck Jaw Alignment?
« Reply #7 on: March 30, 2021, 11:30:26 AM »
If you look at the picture closely (you can see the numbers), accessory jaw 1 is fitted to Chuck jaw 1. All the others are also fitted in the correct order.

Best practice in normal circumstances is to fit the accessory jaws without fully tightening the fixing screws, tighten the Chuck to centralist the jaws then nip the fixing screws up. I’ve tried this and as noted above several other ways but if the screw holes aren’t in the right place the accessory jaws can’t sit in the right place.

The Chuck jaws have not been removed from the body and are obviously in the correct positions.
« Last Edit: March 30, 2021, 12:05:05 PM by Bill21 »

Offline Bill21

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Re: Record Power Chuck Jaw Alignment?
« Reply #8 on: March 30, 2021, 11:44:13 AM »
Here are a couple of pictures. Picture 1 shows the very best you can get fitting these jaws by holding them centrally and then tightening the screws. You can clearly see the error. If you just fit the accessory jaws allowing them to find their own position you end up with the situation in picture 2!

Offline Bill21

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Re: Record Power Chuck Jaw Alignment?
« Reply #9 on: March 30, 2021, 11:44:47 AM »
Picture 1


Offline John D Smith

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Re: Record Power Chuck Jaw Alignment?
« Reply #10 on: March 30, 2021, 07:41:33 PM »

  Hi Bill I might not have explained myself clearly take the accessory jaws off then take off the carrier jaws put the back on making sure they go on to the scroll correctly that's all i can think of

                                              Regards John
John Smith

Offline Sandy

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Re: Record Power Chuck Jaw Alignment?
« Reply #11 on: March 30, 2021, 08:06:58 PM »
Hi Bill

Now I see the images of your jaws I agree it would be very unlikely for these to 'spread'.  The pin jaws I have (Nova) are less substantial and I believe I have managed to 'spread' at least one of my jaws.

I agree your images do definitely show a significant problem.  I'm assuming you haven't had a response from RP yet?  I would definitely be pushing RP for a prompt response and would be requesting an immediate replacement or refund - depending on what you prefer.  I'd be wanting RP to exchange and send you a replacement chuck and set of pin jaws.

I would definitely not do anything to affect / invalidate the warranty:
Quote
It seems on my particular example either the M5 tapped holes in the Chuck jaws are slightly off or the holes in the accessory jaws are? I think I can fix this by using different screws and perhaps a little light fettling. It shouldn’t be necessary of course. Maybe I’ve just got a rogue example or maybe there are more out there like this?




Offline Bill21

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Re: Record Power Chuck Jaw Alignment?
« Reply #12 on: March 30, 2021, 11:13:56 PM »

  Hi Bill I might not have explained myself clearly take the accessory jaws off then take off the carrier jaws put the back on making sure they go on to the scroll correctly that's all i can think of

                                              Regards John

I can’t imagine RP would have sent out a Chuck incorrectly assembled but I did see a video the other day about taking RP chucks apart and the jaws are in the right place. It may be worth some experimentation though at a later date.  ;)

I have been concentrating on the pin jaws as that why I bought the Chuck. I did today, with some difficulty manage to fit the standard jaws fairly well but whether they remain in the set position in use remains to be seen. I’m inclined therefore to believe the Chuck itself is probably ok. The pin jaws I think need to be replaced.

Record Power have been in touch but they no doubt at this stage believe it’s operator error. I need to convince them to let me return the pin jaws to see if they can fit them centrally on a Chuck. I’m convinced they won’t be able to.

I’m somewhat relieved that I think the Chuck itself is ok. As a hobby machinist with a Mill and metalwork lathe I’m fairly confident I can fettle the pin jaws to fit, possibly with some new bolts if RP can’t supply a good set of jaws. A bit disappointing but I think I can deal with it. No other manufacturer makes pin jaws this size as far as I’m aware so not much choice!  :)

Offline Bill21

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Re: Record Power Chuck Jaw Alignment?
« Reply #13 on: April 01, 2021, 10:52:33 AM »
No more contact from Record Power.  :( Anyone else had to deal with them with product issues?

Offline Twisted Trees

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Re: Record Power Chuck Jaw Alignment?
« Reply #14 on: April 01, 2021, 12:36:51 PM »
Not dealt with them in a while, but they were good when my bandsaw motor packed up, but that was not a bank holiday week and before covid!
TT, AKA Pete, but that name is taken :-)