Re: [Emc-users] ER-20A nuts for TTS adaptors

[Gene Heskett]

On Tuesday 12 April 2016 11:49:20 Ken Strauss wrote:

> The ER40 nut that I ordered directly from Gloster definitely has a
> ball bearing.
>
That is what I thought I was getting.

But the ER20 doesn't really have room for a serious bearing, one that I 
couldn't crush the balls in with  a 10" crescent wrench.  Any bearing 
ball that would fit in that space would have to be .0625" balls maximum, 
probably smaller. And if not  crushed, the races badly brinneled at 
least than the normal snugging up torque.

I wish I had some of your bigger "toys". ;-)  OTOH, this has done nearly 
everything I've asked it to do so far, including making and then  
driving its own molding cutter about 4" across.

Thanks Ken.

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] ER-20A nuts for TTS adaptors

[Gene Heskett]

On Tuesday 12 April 2016 11:33:16 Todd Zuercher wrote:

> Techniks sells nuts that they claim are better than ball bearing nuts,
> because of their "Powercoat".
> http://www.techniksusa.com/metal/pwrctnt.htm
> And they do tighten down very nicely, at least when new.  After
> they've been used for a few years I'm a bit skeptical.  I've found the
> finish does wear off of the collet contacting surface fairly quickly, 
> I think the tightening advantage comes more from the coating on the
> threads, that seems to last longer than the part against the collet
> nose.  Still it does wear off eventually.
>
> How often should these things be replaced?  We have some that have
> been in service for 10+ years of multiple daily tool replacement. (and
> it shows.)
>
> Worst tool holder/nut combo I've used were some HSK63F ER40 tool
> holders from T-ToolUSA.  We've had a lot of trouble with the threads
> on these nuts and tool holders galling.  One hung up so bad I almost
> couldn't get it off, tearing out large chunks of thread in the
> process.  And these were only torqued to 90ft/lbs (using a proper
> torque wrench).

I haven't yet experienced any of that, but ER-40's are way above my pay 
grade as the biggest spindle I have is a 1 horse, spinning an R8 socket.  
I do use a 10" crescent to pull these up once the spindle is pinned but 
doubt if I've ever exceeded 50 lb/ft even when trying to keep a tap from 
slipping. My spindle pinner is home-made, and any more torque than that 
may shear the mounting bolts holding the block carrying the pin to the 
clamp collar on the spindle housing.  TBT, I didn't use a big enough 
pair of bolts. 4mm's IIRC.

I did get a full set of 1-13mm ER20 metric collets just now too, so I 
should be able to get a decent grip on the shank of most any tap my 
spindle can turn. 3/8-18 and 10mm need lots of fractional turn pecking 
so I'd best not try anything any bigger anyway.  ER20 collets with 
square rear sockets can be had, at seriously ohmygawd prices though.

Thanks Todd.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] ER-20A nuts for TTS adaptors

[Ken Strauss]

The ER40 nut that I ordered directly from Gloster definitely has a ball
bearing.

> -Original Message-
> From: Gene Heskett [mailto:ghesk...@wdtv.com]
> Sent: Tuesday, April 12, 2016 11:38 AM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] ER-20A nuts for TTS adaptors
>
> On Tuesday 12 April 2016 10:56:04 andy pugh wrote:
>
> > On 12 April 2016 at 15:48, Gene Heskett  wrote:
> > > Greetings all;
> > >
> > > I bought 5 of what were purported to be the higher torque capable
> > > ER-20 nuts, implying the cone in the nut was ball bearing supported.
> > >  What I received yesterday were very well finished nuts, but the
> > > front cone was not hiding a ball bearing.
> >
> > Were these the ones from Gloster tooling?
>
> I'd have to say no, Andy.  No trace of Gloster tooling anyplace in the
shipping
> notice, spamassassin caught it and I saved it anyway. Took me a while to
find
> it as I'd moved it to the ham directory, then to keep once sa-learn had
seen it,
> instead of back to the inbox.  The china post bag says its from: JIANWEI
> HUANG, at a long gobbledygook address in Guangdong China.
>
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page <http://geneslinuxbox.net:6309/gene>
>
>

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Manager
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tiers
> of your business applications. It resolves application problems quickly
and
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Re: [Emc-users] ER-20A nuts for TTS adaptors

[Gene Heskett]

On Tuesday 12 April 2016 10:56:04 andy pugh wrote:

> On 12 April 2016 at 15:48, Gene Heskett  wrote:
> > Greetings all;
> >
> > I bought 5 of what were purported to be the higher torque capable
> > ER-20 nuts, implying the cone in the nut was ball bearing supported.
> >  What I received yesterday were very well finished nuts, but the
> > front cone was not hiding a ball bearing.
>
> Were these the ones from Gloster tooling?

I'd have to say no, Andy.  No trace of Gloster tooling anyplace in the 
shipping notice, spamassassin caught it and I saved it anyway. Took me a 
while to find it as I'd moved it to the ham directory, then to keep once 
sa-learn had seen it, instead of back to the inbox.  The china post bag 
says its from: JIANWEI HUANG, at a long gobbledygook address in 
Guangdong China.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] ER-20A nuts for TTS adaptors

[Todd Zuercher]

Techniks sells nuts that they claim are better than ball bearing nuts, because 
of their "Powercoat".   
http://www.techniksusa.com/metal/pwrctnt.htm
And they do tighten down very nicely, at least when new.  After they've been 
used for a few years I'm a bit skeptical.  I've found the finish does wear off 
of the collet contacting surface fairly quickly,  I think the tightening 
advantage comes more from the coating on the threads, that seems to last longer 
than the part against the collet nose.  Still it does wear off eventually.

How often should these things be replaced?  We have some that have been in 
service for 10+ years of multiple daily tool replacement. (and it shows.)

Worst tool holder/nut combo I've used were some HSK63F ER40 tool holders from 
T-ToolUSA.  We've had a lot of trouble with the threads on these nuts and tool 
holders galling.  One hung up so bad I almost couldn't get it off, tearing out 
large chunks of thread in the process.  And these were only torqued to 90ft/lbs 
(using a proper torque wrench).

- Original Message -
From: "Gene Heskett" 
To: emc-users@lists.sourceforge.net
Sent: Tuesday, April 12, 2016 10:48:09 AM
Subject: [Emc-users] ER-20A nuts for TTS adaptors

Greetings all;

I bought 5 of what were purported to be the higher torque capable ER-20 
nuts, implying the cone in the nut was ball bearing supported.  What I 
received yesterday were very well finished nuts, but the front cone was 
not hiding a ball bearing. Marked as ER-20-A, they are quite well 
finished, so I will keep them, but be aware that there are less than 
truthfull descriptions out there on fleabay. I think we all knew that, 
but hope springs eternal I guess, so I bit on what seemed to be a good 
deal... :(

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] ER-20A nuts for TTS adaptors

[andy pugh]

On 12 April 2016 at 15:48, Gene Heskett  wrote:
> Greetings all;
>
> I bought 5 of what were purported to be the higher torque capable ER-20
> nuts, implying the cone in the nut was ball bearing supported.  What I
> received yesterday were very well finished nuts, but the front cone was
> not hiding a ball bearing.

Were these the ones from Gloster tooling?



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atp
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