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Re: Does anyone make new thread guides for the db /sl?

 

Were they hardened? More to the point, since the followers are brass, can you get away with not hard? And are they cut with a buttress thread form? I've never actually seen a threading attachment.

Tim in VT
Re: Does anyone make new thread guides for the db /sl?

 

I just ran out back to look at my Clausing 4902. It has 27 tpi right on the QCGB. Also 22,23,24,26,28, then jumps to 32. No 25, no 30.?

OTOH, I looked up the Atlas threading supplement and a 10F will do 25,27,and 30. Atlas for the win! But you shouldn't need a 32T gear to do this.?
Re: Does anyone make new thread guides for the db /sl?

 

This has piqued my curiosity¡ªwhat equipment used 27tpi? It must have been common enough somewhere b/c I just googled it and found it's stupid easy to get 3/4-27tpi taps and dies. Not even that dear, really, the tap is under $25.

Tim in VT
Re: Does anyone make new thread guides for the db /sl?

 

I am not going to call an Atlas lathe modern, but the threading chart I just looked at lists 27tpi as a regular thread. I have a need to cut 30tpi threads, and I'm going to need a 2nd 32-tooth gear for it. 3D printed one, can't wait to test and find out! At one time, I also wanted to do a 25tpi thread. Don't recall exactly why, now. That one is not on the chart. Going to have to dig through my threading supplement to see if it has a setup for that one, in case I remember why I wanted it. ;)

Anyone want to send me drawings for the parts needed to do 27tpi threading??

Bill in OKC

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better



On Tuesday, February 28, 2023 at 09:48:44 PM CST, Keith S. Angus <keithsangus@...> wrote:


On Tue, Feb 28, 2023 at 11:06 PM, OldToolmaker wrote:
Given the high price of vintage Unimat thread masters, some thought might have to be given
into machining some thread masters to order.

I'm not sure it would be easy to set up many modern lathes to cut 27 tpi. Not sure about some of the older ones either. I'll have a look at our old (1950s vintage) Cardiff to see if that can do it, and how much hassle it would be.

Re: Does anyone make new thread guides for the db /sl?

 

On Tue, Feb 28, 2023 at 11:06 PM, OldToolmaker wrote:
Given the high price of vintage Unimat thread masters, some thought might have to be given
into machining some thread masters to order.

I'm not sure it would be easy to set up many modern lathes to cut 27 tpi. Not sure about some of the older ones either. I'll have a look at our old (1950s vintage) Cardiff to see if that can do it, and how much hassle it would be.
Re: Does anyone make new thread guides for the db /sl?

 

Given the high price of vintage Unimat thread masters, some thought might have to be given
into machining some thread masters to order.
Re: Three jaws chuck tightening

 

¿ªÔÆÌåÓý

Hi Gang:

In Trade School they recommended facing from the outside to the center. The rationale is if you start in the center and one corner is high, it will be too heavy to finish the cut. Light cuts are the way to go on a Unimat, the parts are small and the cuts are usually short.

Do get the proper Tommy Bars, and keep the cuts light.

Carl.

On 2/28/2023 9:41 AM, quinngolden@... wrote:

Regarding your question about the stock moving in the chuck. ?You should get a proper set of Tommy bars to tighten the chuck as well as cleaning it as others have mentioned. ?Also check your facing tool center height and that the tool is sharp.?

Re: Three jaws chuck tightening

 

Regarding your question about the stock moving in the chuck. ?You should get a proper set of Tommy bars to tighten the chuck as well as cleaning it as others have mentioned. ?Also check your facing tool center height and that the tool is sharp.?
Re: Does anyone make new thread guides for the db /sl?

 

¿ªÔÆÌåÓý

Interesting¡­ thanks!

Best Regards
John



On Feb 27, 2023, at 9:48 PM, OldToolmaker via groups.io <old_toolmaker@...> wrote:

?Hello John,

If 27 TPI thread guide are not available for the Unimat SL I can think of at least two ways to make a thread master to fit the SL.
(1) If you have access to a thread cutting lathe you can make an exact copy that will mount right on your SL. This would be my preference.
(2) You can buy a 1/8-27 straight pipe nipple from a hardware store and use it as a master. These can be purchased in fairly long lengths and they are often used in lamps. Of course, you will still need to make a follower to mesh with the master. A 1/8¡±-27 pipe fitting could be pressed into service for this.

Re: Does anyone make new thread guides for the db /sl?

 

Hello John,

If 27 TPI thread guide are not available for the Unimat SL I can think of at least two ways to make a thread master to fit the SL.
(1) If you have access to a thread cutting lathe you can make an exact copy that will mount right on your SL. This would be my preference.
(2) You can buy a 1/8-27 straight pipe nipple from a hardware store and use it as a master. These can be purchased in fairly long lengths and they are often used in lamps. Of course, you will still need to make a follower to mesh with the master. A 1/8¡±-27 pipe fitting could be pressed into service for this.
Re: Does anyone make new thread guides for the db /sl?

 

On Mon, Feb 27, 2023 at 08:55 PM, clankennedy2004 wrote:
there's a 1/8" BSP tap that's also 27tpi
1/8 BSP is 28 tpi, not 27. It is a constant problem here that the USA and UK thread standards often differ by only 1 tpi thus avoiding any hope of compatibility while being similar enough to cause confusion.

I've looked through my thread pitch tables and can't see anything 27 tpi in the usual British range, nor in any of the other ranges I have listed, I recall it was used on some pipe threads, for example on 5/8" diameter microphone stands. It doesn't work out to be anything close enough in metric threads either. Mert, late of this parish, had a method that worked if you had a smaller thread of the correct pitch, say a nut and bolt. I would think that a bit of 1/16 or 1/8 NP should be usable, but it will take a bit of setting up, and getting internal threads right is a bit of a pain. I hope you will be working in a good material like hard brass!
Re: Does anyone make new thread guides for the db /sl?

 

¿ªÔÆÌåÓý

Thanks Jeff.?

Best Regards
John



On Feb 27, 2023, at 5:02 PM, Jkle379184 via groups.io <jkle379184@...> wrote:

?
?They did not offer a 27 TPI, only 26 & 28 TPI.
?Jeff


-----Original Message-----
From: Peter ashby via groups.io <aescinga.pgen@...>
To: [email protected]; [email protected]
Sent: Mon, Feb 27, 2023 3:05 pm
Subject: Re: [Unimat] Does anyone make new thread guides for the db /sl?


I would imagine in this modern world that you could 3d print new guides at whatever pitch you required.

------ Original Message ------
From "John Entwistle via groups.io" <jentwistle3@...>
Date 27/02/2023 03:55:31
Subject [Unimat] Does anyone make new thread guides for the db /sl?

I need to cut internal 3/4 x 27 and 1 x 27 threads for an automobile dashboard I¡¯m restoring. Want to do it myself on my sl, if possible. There are no 27 tpi guides for sale on ebay (did they even make one). Does anyone make new guides?

Re: Does anyone make new thread guides for the db /sl?

 

?They did not offer a 27 TPI, only 26 & 28 TPI.
?Jeff


-----Original Message-----
From: Peter ashby via groups.io <aescinga.pgen@...>
To: [email protected]; [email protected]
Sent: Mon, Feb 27, 2023 3:05 pm
Subject: Re: [Unimat] Does anyone make new thread guides for the db /sl?


I would imagine in this modern world that you could 3d print new guides at whatever pitch you required.

------ Original Message ------
From "John Entwistle via groups.io" <jentwistle3@...>
Date 27/02/2023 03:55:31
Subject [Unimat] Does anyone make new thread guides for the db /sl?

I need to cut internal 3/4 x 27 and 1 x 27 threads for an automobile dashboard I¡¯m restoring. Want to do it myself on my sl, if possible. There are no 27 tpi guides for sale on ebay (did they even make one). Does anyone make new guides?

Re: Does anyone make new thread guides for the db /sl?

 

Thanks Bill. Yeah, I've always lusted after the MKII 3.8 liter.?


-----Original Message-----
From: clankennedy2004 via groups.io <clankennedy2004@...>
To: [email protected] <[email protected]>
Sent: Mon, Feb 27, 2023 3:55 pm
Subject: Re: [Unimat] Does anyone make new thread guides for the db /sl?

Hi John, I'm unsure what you mean by guides ? Are you referring to thread gauges ?

On Monday, 27 February 2023 at 20:30:46 GMT, Bill in OKC too via groups.io <wmrmeyers@...> wrote:


I'm not aware of anyone making new guides, but you could use a 27tpi pipe thread tap (or possibly die) to make the guide you need. If you're in the US, 1/8" and 1/16" NPT taps are 27 TPI. IIRC, there's a 1/8" BSP tap that's also 27tpi. I grabbed one by mistake when I was building my pipe tap collection some years ago. I expect I still have it, but haven't found a use for it yet, being in the US myself. If I'd ever managed to get the Jaguar XK Saloon car I wanted...

Bill in OKC

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better



On Monday, February 27, 2023 at 01:59:38 PM CST, John Entwistle via groups.io <jentwistle3@...> wrote:


I need to cut internal 3/4 x 27 and 1 x 27 threads for an automobile dashboard I¡¯m restoring. Want to do it myself on my sl, if possible. There are no 27 tpi guides for sale on ebay (did they even make one). Does anyone make new guides?

Re: Does anyone make new thread guides for the db /sl?

 

Hi John, I'm unsure what you mean by guides ? Are you referring to thread gauges ?

On Monday, 27 February 2023 at 20:30:46 GMT, Bill in OKC too via groups.io <wmrmeyers@...> wrote:


I'm not aware of anyone making new guides, but you could use a 27tpi pipe thread tap (or possibly die) to make the guide you need. If you're in the US, 1/8" and 1/16" NPT taps are 27 TPI. IIRC, there's a 1/8" BSP tap that's also 27tpi. I grabbed one by mistake when I was building my pipe tap collection some years ago. I expect I still have it, but haven't found a use for it yet, being in the US myself. If I'd ever managed to get the Jaguar XK Saloon car I wanted...

Bill in OKC

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better



On Monday, February 27, 2023 at 01:59:38 PM CST, John Entwistle via groups.io <jentwistle3@...> wrote:


I need to cut internal 3/4 x 27 and 1 x 27 threads for an automobile dashboard I¡¯m restoring. Want to do it myself on my sl, if possible. There are no 27 tpi guides for sale on ebay (did they even make one). Does anyone make new guides?

Re: Does anyone make new thread guides for the db /sl?

 

I'm not aware of anyone making new guides, but you could use a 27tpi pipe thread tap (or possibly die) to make the guide you need. If you're in the US, 1/8" and 1/16" NPT taps are 27 TPI. IIRC, there's a 1/8" BSP tap that's also 27tpi. I grabbed one by mistake when I was building my pipe tap collection some years ago. I expect I still have it, but haven't found a use for it yet, being in the US myself. If I'd ever managed to get the Jaguar XK Saloon car I wanted...

Bill in OKC

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better



On Monday, February 27, 2023 at 01:59:38 PM CST, John Entwistle via groups.io <jentwistle3@...> wrote:


I need to cut internal 3/4 x 27 and 1 x 27 threads for an automobile dashboard I¡¯m restoring. Want to do it myself on my sl, if possible. There are no 27 tpi guides for sale on ebay (did they even make one). Does anyone make new guides?

Re: Three jaws chuck tightening

 

Giving your chuck a good cleaning is a great idea! It absolutely cannot hurt if you do it right. One way you could do it, which may or may not be exactly right, is to thoroughly hose it down, inside and out, with WD-40 or something similar. Taking it completely apart and do the hosing down with WD-40 or equivalent is a better way to do it. If you find the internals rusty, even if you didn't see any rust on the outside, complete disassembly and de-rusting is where you need to go. You can use EvapoRust, PB-Blaster, or equivalents, electrolytic rust removal, scrubbing with wire brushes or Scotch-brite pads, vinegar, molasses, Naval Jelly, phosphoric acid, and God alone knows how many other ways there are to remove rust. Clean it, get it thoroughly dry, and oil the pieces with a light machine oil. I have used hydrochloric (aka Muriatic) acid and acetic acid to remove rust, but don't recommend them anymore. Vinegar is acetic acid lots of water, and not nearly as hazardous as the purer acid is.?

WD-40 penetrating oil is NOT a good rust preventative long term, though it is excellent for a short time. Acetone, mineral spirits, Dawn and similar degreasing dish detergents can also be excellent for removing the remnants of the WD-40 after the solvent evaporates. WD-40 will remove grease and oil that has turned to varnish. Electrolytic rust removal will remove rust, paint, and if you connect the anode and cathode incorrectly, the iron itself. Be careful! Also don't ask how I know. ;)

Chemists used to (may still do) rinse glassware with distilled water, alcohol, and ether. They needed absolutely no traces of the wash water left on the glassware.? Each was soluble in the next, so you wound up with all of them evaporating off with no residue left. You can get away with just the distilled water and alcohol for our purposes. ;) Rinse with distilled water, then with high-proof alcohol. I use 91% Isopropyl alcohol for that purpose. It won't remove oil, but the acetone or whatever should have already done that before you rinsed it.? Then, again, oil the parts! :)

It should work as well for you as is possible then. If you leave too much oil on the chuck, don't be surprised to get a strip of oil spattered up your shirt, face, and glasses. You want a thin film so the parts slide well, without enough to fly off the chuck once it spins up.?

HTH!

Bill in OKC?

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better



On Monday, February 27, 2023 at 01:59:25 PM CST, Jeff R. Allen <jra@...> wrote:


Hi guys,

I am a brand new Unimat SL user. I was working through the first example in the manual, cutting a short piece of aluminum various different ways.

I got my stock generally running true in the three jaw chuck and tightened it down using the handle of the chuck key and another convenient piece of metal in my kit to lever against each other. But when I went to face it off, I found that the force from the cutter was too much and it moved in the chuck. (I was facing off from outside in, is that right?)

I feel like I'm missing something about how to operate the three jaw chuck: the mini one from the Unimat does not work like the bigger ones I see on videos.

I feel like my chuck is pretty sticky (though not enough to prevent it working), I'm thinking of giving it a cleaning. Any hints on that?

Jeff
Re: Does anyone make new thread guides for the db /sl?

Jeff R. Allen
 

I have a bit of expertise with OpenSCAD, I'd be willing to try modeling the thread guide for you, if you guys can give me a spec for what the inner dimensions and the dimensions of the follower should be.

Jeff

On Mon, Feb 27, 2023, 21:05 Peter ashby via <aescinga.pgen=[email protected]> wrote:

I would imagine in this modern world that you could 3d print new guides at whatever pitch you required.

------ Original Message ------
From "John Entwistle via " <jentwistle3@...>
Date 27/02/2023 03:55:31
Subject [Unimat] Does anyone make new thread guides for the db /sl?

I need to cut internal 3/4 x 27 and 1 x 27 threads for an automobile dashboard I¡¯m restoring. Want to do it myself on my sl, if possible. There are no 27 tpi guides for sale on ebay (did they even make one). Does anyone make new guides?

Re: Does anyone make new thread guides for the db /sl?

 


I would imagine in this modern world that you could 3d print new guides at whatever pitch you required.

------ Original Message ------
From "John Entwistle via groups.io" <jentwistle3@...>
Date 27/02/2023 03:55:31
Subject [Unimat] Does anyone make new thread guides for the db /sl?

I need to cut internal 3/4 x 27 and 1 x 27 threads for an automobile dashboard I¡¯m restoring. Want to do it myself on my sl, if possible. There are no 27 tpi guides for sale on ebay (did they even make one). Does anyone make new guides?

Does anyone make new thread guides for the db /sl?

 

I need to cut internal 3/4 x 27 and 1 x 27 threads for an automobile dashboard I¡¯m restoring. Want to do it myself on my sl, if possible. There are no 27 tpi guides for sale on ebay (did they even make one). Does anyone make new guides?
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