Re: [Emc-users] Suggestions for cutting an odd little thread.

2023-05-11 Thread gene heskett 

On 5/11/23 17:24, andy pugh wrote:

On Thu, 11 May 2023 at 17:54, Todd Zuercher  wrote:


Might it be simpler to remake both screws and change the knurled locking screw 
to a more conventional thread?


Yes, but I don't think the average Rivett owner would sleep easy
knowing that part of their lathe had the wrong thread :-)


Andy, there's one thing I'd never do, is call you the average Rivett owner.

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, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 



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Re: [Emc-users] Suggestions for cutting an odd little thread.

2023-05-11 Thread andy pugh 
On Thu, 11 May 2023 at 17:54, Todd Zuercher  wrote:
>
> Might it be simpler to remake both screws and change the knurled locking 
> screw to a more conventional thread?

Yes, but I don't think the average Rivett owner would sleep easy
knowing that part of their lathe had the wrong thread :-)

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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Re: [Emc-users] Suggestions for cutting an odd little thread.

2023-05-11 Thread andy pugh 
On Thu, 11 May 2023 at 18:49, Moses McKnight  wrote:

> A quick search for #10-30 turned up several links in the US, but I assume
> shipping to the UK should not be too bad?
>
> https://www.victornet.com/detail/TAST-10-30.html

"Not accepting export orders (and also have a $25 minimum)

> https://www.biscotoolsupply.com/10-30-special-hand-taps

These say "Will quote" for shipping. So I have given them the
opportunity to do so.
Though it might be simpler to buy these from eBay. ($20 shipping)
https://www.ebay.com/itm/255422932330

(There is a pack of 60 on there too, which seems more than anyone
would ever want)

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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Re: [Emc-users] Suggestions for cutting an odd little thread.

2023-05-11 Thread gene heskett 

On 5/11/23 12:16, andy pugh wrote:

The Rivett 608 lathe has knurled screws to lock the micrometer dials.
These are quite long, going down the centre of the feedscrew and
pushing out a radial wedge.

I am making some new feedscrews and have realised that these screws
are threaded 0.190" x 30

This is probably #10-30 though 3/16 is possible. However I have never
found a screw to be _above_ nominal diameter, so think it is #10-30.

#10-30 is listed as an old ASME (pre-war) standard. But finding the
taps in the UK seems about as easy as you would expect.

Go ahead and say it, pure unobtainium. ;o)  I've not heard of 10-30 
before. We have 10-24 and 10-32, once common in 19" equipment racks but 
even those seem to have switched to 3/16-24 screws in the last 30 years



So, how else to cut the thread? Maybe a very tiny thread mill?
Single-point cutting might work, but it's a rather deep thread for the
diameter. And I don't have a suitable tool (such as
https://www.ebay.com/itm/383646508366 ).

One could say they are quite proud of those.
 Thread-milling would be an

excuse to add live tooling to the lathe, and an almost-suitable cutter
is affordable: 
https://www.shop-apt.co.uk/single-tooth-thread-mills-for-general-use-internal-60-partial-profile/internal-partial-profile-60-thread-mill-05-08mm-pitch.html


That's much more reasonable. Is it long enough...
Since you're making the feedscrews, any chance you could do these in 3 
to 5mm metric? Think of it as modernizing the design.


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, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 



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Re: [Emc-users] Suggestions for cutting an odd little thread.

2023-05-11 Thread Moses McKnight 
A quick search for #10-30 turned up several links in the US, but I assume 
shipping to the UK should not be too bad?


https://www.victornet.com/detail/TAST-10-30.html
https://www.biscotoolsupply.com/10-30-special-hand-taps


On 5/11/23 12:01, Peter Hodgson wrote:

You might like to give:

tracytools.com

a call. They are in the UK and list a 3/16 x 30 UNS on their site although 
currently no stock. They’re generally very helpful.



On 11 May 2023, at 17:16, andy pugh  wrote:

The Rivett 608 lathe has knurled screws to lock the micrometer dials.
These are quite long, going down the centre of the feedscrew and
pushing out a radial wedge.

I am making some new feedscrews and have realised that these screws
are threaded 0.190" x 30

This is probably #10-30 though 3/16 is possible. However I have never
found a screw to be _above_ nominal diameter, so think it is #10-30.

#10-30 is listed as an old ASME (pre-war) standard. But finding the
taps in the UK seems about as easy as you would expect.

So, how else to cut the thread? Maybe a very tiny thread mill?
Single-point cutting might work, but it's a rather deep thread for the
diameter. And I don't have a suitable tool (such as
https://www.ebay.com/itm/383646508366 ). Thread-milling would be an
excuse to add live tooling to the lathe, and an almost-suitable cutter
is affordable: 
https://www.shop-apt.co.uk/single-tooth-thread-mills-for-general-use-internal-60-partial-profile/internal-partial-profile-60-thread-mill-05-08mm-pitch.html

--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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 And as it is appointed unto men once to die, but after this the judgment:
 So Christ was once offered to bear the sins of many; and unto them that look 
for him shall he appear the second time without sin unto salvation.

(Hebrews 9:27-28)


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Re: [Emc-users] Suggestions for cutting an odd little thread.

2023-05-11 Thread Peter Hodgson 
You might like to give:

tracytools.com

a call. They are in the UK and list a 3/16 x 30 UNS on their site although 
currently no stock. They’re generally very helpful.


> On 11 May 2023, at 17:16, andy pugh  wrote:
> 
> The Rivett 608 lathe has knurled screws to lock the micrometer dials.
> These are quite long, going down the centre of the feedscrew and
> pushing out a radial wedge.
> 
> I am making some new feedscrews and have realised that these screws
> are threaded 0.190" x 30
> 
> This is probably #10-30 though 3/16 is possible. However I have never
> found a screw to be _above_ nominal diameter, so think it is #10-30.
> 
> #10-30 is listed as an old ASME (pre-war) standard. But finding the
> taps in the UK seems about as easy as you would expect.
> 
> So, how else to cut the thread? Maybe a very tiny thread mill?
> Single-point cutting might work, but it's a rather deep thread for the
> diameter. And I don't have a suitable tool (such as
> https://www.ebay.com/itm/383646508366 ). Thread-milling would be an
> excuse to add live tooling to the lathe, and an almost-suitable cutter
> is affordable: 
> https://www.shop-apt.co.uk/single-tooth-thread-mills-for-general-use-internal-60-partial-profile/internal-partial-profile-60-thread-mill-05-08mm-pitch.html
> 
> -- 
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1912
> 
> 
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> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users


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Re: [Emc-users] Suggestions for cutting an odd little thread.

2023-05-11 Thread Todd Zuercher 
Might it be simpler to remake both screws and change the knurled locking screw 
to a more conventional thread?

Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street
Dalton, Ohio 44618
Phone:  (330)828-2105ext. 2031

-Original Message-
From: andy pugh 
Sent: Thursday, May 11, 2023 12:15 PM
To: Enhanced Machine Controller (EMC) 
Subject: [Emc-users] Suggestions for cutting an odd little thread.

[EXTERNAL EMAIL] Be sure links are safe.

The Rivett 608 lathe has knurled screws to lock the micrometer dials.
These are quite long, going down the centre of the feedscrew and pushing out a 
radial wedge.

I am making some new feedscrews and have realised that these screws are 
threaded 0.190" x 30

This is probably #10-30 though 3/16 is possible. However I have never found a 
screw to be _above_ nominal diameter, so think it is #10-30.

#10-30 is listed as an old ASME (pre-war) standard. But finding the taps in the 
UK seems about as easy as you would expect.

So, how else to cut the thread? Maybe a very tiny thread mill?
Single-point cutting might work, but it's a rather deep thread for the 
diameter. And I don't have a suitable tool (such as
https://www.ebay.com/itm/383646508366 ). Thread-milling would be an excuse to 
add live tooling to the lathe, and an almost-suitable cutter is affordable: 
https://www.shop-apt.co.uk/single-tooth-thread-mills-for-general-use-internal-60-partial-profile/internal-partial-profile-60-thread-mill-05-08mm-pitch.html

--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is designed for 
the especial use of mechanical geniuses, daredevils and lunatics."
- George Fitch, Atlanta Constitution Newspaper, 1912


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Re: [Emc-users] Suggestions for cutting an odd little thread.

2023-05-11 Thread andy pugh 
On Thu, 11 May 2023 at 17:42, John Dammeyer  wrote:
>
> Possibly just make a tap?

I don't think that I can make one good enough, and strong enough, to
tap this depth in multiple tool-steel parts.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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Re: [Emc-users] Suggestions for cutting an odd little thread.

2023-05-11 Thread John Dammeyer 
Possibly just make a tap?
John

> -Original Message-
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: May-11-23 9:15 AM
> To: Enhanced Machine Controller (EMC)
> Subject: [Emc-users] Suggestions for cutting an odd little thread.
> 
> The Rivett 608 lathe has knurled screws to lock the micrometer dials.
> These are quite long, going down the centre of the feedscrew and
> pushing out a radial wedge.
> 
> I am making some new feedscrews and have realised that these screws
> are threaded 0.190" x 30
> 
> This is probably #10-30 though 3/16 is possible. However I have never
> found a screw to be _above_ nominal diameter, so think it is #10-30.
> 
> #10-30 is listed as an old ASME (pre-war) standard. But finding the
> taps in the UK seems about as easy as you would expect.
> 
> So, how else to cut the thread? Maybe a very tiny thread mill?
> Single-point cutting might work, but it's a rather deep thread for the
> diameter. And I don't have a suitable tool (such as
> https://www.ebay.com/itm/383646508366 ). Thread-milling would be an
> excuse to add live tooling to the lathe, and an almost-suitable cutter
> is affordable: 
> https://www.shop-apt.co.uk/single-tooth-thread-mills-for-general-use-internal-60-partial-
> profile/internal-partial-profile-60-thread-mill-05-08mm-pitch.html
> 
> --
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> � George Fitch, Atlanta Constitution Newspaper, 1912
> 
> 
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users



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