Ballscrew Nut Replacement Parts

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15 Jul 2019 01:57 #139347 by electrosteam
I have a THK BNT3210B ballscrew off my turret mill for a general clean.

The nut wipers are somewhat worn/distorted and the ball return tubes show damage from a previous attempt to remove them with a sharp tool (not by me).

I am in Australia and all the local suppliers I have contacted say spare parts are not available.

Can anyone suggest a possible source ?

Thanks in advance,
John.

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15 Jul 2019 08:07 #139377 by pl7i92
hi from australia
there woudt be Taiwan a sugest
dgfa has this parts in stock

www.dgfa1.com/shop/shop.htm?brandcode=02...0331&type=shopdetail

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15 Jul 2019 10:29 #139405 by tommylight
PL7i92 is right, Taiwan might be your best option, check HiWin they have high quality stuff at half the price of NSK or THK.

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15 Jul 2019 13:51 #139426 by rodw
The only 2 I know are TEA Transmissions and Statewide Bearings who have a motion division here in Brisbane.

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18 Jul 2019 12:12 #139792 by electrosteam
Statewidebearings (WA) are listed by THK as the Australian distributors.
Contacted them, got referral to Vic, who said 'no parts available'.
I will try TEA.

The HiWin site looks good, definitely worth a closer look when the time comes for the next CNC machine.

Looked on dfa1 in Korea, they are impressive.
Found a matching used ballscrew/nut/bearings combination at an acceptable price.
But, my email to them is so far unanswered.
Their website is in Korean with prices in WON, and no indication of an easy international selling path.

Anyone got the secret to getting a discussion going with a Korean company ?

John

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18 Jul 2019 12:45 #139794 by rodw

electrosteam wrote: Statewidebearings (WA) are listed by THK as the Australian distributors.
John


John, re Statewide Bearings
Try talking to:
Martin Corcoran
LINEAR DIVISION - QUEENSLAND
Statewide Bearings
902 Beaudesert Road
Coopers Plains, QLD 4108
T (07) 3717 4452

Statewide purchased a linear drive company here in QLD and Martin came with the sale so he's been in that industry for years. He is very helpful. And remember, we get up 2 hours before you guys do on that side of the country. I suspect the THK dealership came from that purchase.

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22 Jul 2019 23:18 #140250 by electrosteam
Thanks Rod,
Spoke to Martin but he had the same story - impossible to get replacement parts.

Still waiting on a reply from dgfa1 in Taiwan.
Today I will use Google Translate to send a follow-up inquiry.

John.

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25 Jul 2019 12:49 #140526 by electrosteam
The Google Translate version of the email went to the Korean address a couple of days ago.
No reply so far.

pl7i92,
Were you able to get communications going ?

John

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10 Sep 2019 11:54 #144686 by electrosteam
Asked around and was introduced to a Korean student at the local university that agreed to help.
Eventually called the web listed number, and was told that they do not deliver to foreign addresses.
Spent some time trying to find a Korean version of 'Shipito'.
Found a website aimed at Korean ex-pats, and a local (Sydney) courier service with an address in Korea.
But, when I re-checked the stock at the seller, no longer listed.
Checked several times since to no avail.

Checked all the balls under a 200x microscope.
Half the balls are worn, but probably re-usable.
The others either show scuff marks or pitting.
The nut has two separate circuits, so one half may have been the problem
I need new balls.

I measure 102 x 6.365 mm and 1 x 6.355 mm (last digit is midway between marks on the micrometer scale).
The micrometer measures spot-on at 5.1 mm and 7.7 mm on slip gauges.
My inspection grade DTI station puts the diameter at closer to 6.37 mm.
Probably 1/4" nominal oversized to fit.

Can anyone comment on how to assess the required ball diameter ?
And a source for 110 balls at not too high a price ?

John

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10 Sep 2019 12:32 #144690 by tommylight
Bicycle shops have them for very cheap, i paid 25 Euro for 200 of them some 10 years ago.
Just checked their size and my very old and battered micrometer says they are 6.4mm ! Most probably that is the reason why they were very tight when using both nuts, so they are still left with the flanged nut only.
Cant see the writing on them but should be 3010 NSK.

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