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Re: Opinions Sought (Cross-Posted)

Andrei
 

¿ªÔÆÌåÓý

Bienvenido, Manuel

From: [email protected] <[email protected]> on behalf of Manuel Ceuma Reverter via groups.io <mcr6025@...>
Sent: Monday, September 18, 2023 6:06 PM
To: [email protected] <[email protected]>
Subject: Re: [Unimat] Opinions Sought (Cross-Posted)
?
Hola,os mando un par de fotos de mi sl con un anagrama poco visto un saludo para todos vosotros sois gente maravillosa,tengo 75 a?os y en mi vida laboral fui tornero,un saludo.? ? ? ? ? ? ? ? ?MANEL.
Re: Opinions Sought (Cross-Posted)

 

Hola,os mando un par de fotos de mi sl con un anagrama poco visto un saludo para todos vosotros sois gente maravillosa,tengo 75 a?os y en mi vida laboral fui tornero,un saludo.? ? ? ? ? ? ? ? ?MANEL.

IMG_20230904_185549.jpg
IMG_20230904_185520_1 (1).jpg

Re: Opinions Sought (Cross-Posted)

 

Hola, aqui os mando la foto de mi Unimat SL,como podeis ver tiene un anagrama diferente a los demas,no se porque motivo,sois un grupo de gente muy interesante,tengo 75 a?os y soy de Barcelona-Espa?a,en mi vida laboral fui mecanico tornero,Saludos.? ? ? ? ? ? ? ? ? ? Manel.
Milling column drawing for Unimat SL

 

Hi everyone, I just bought one of these awesome little machines and I was wondering if there was a drawing for the milling column assembly for the emco unimat sl lathe. If I'm not mistaken it's the DB503 assembly.
Thank you for your help,
Csaba
Re: Off Topic measuring units

 

¿ªÔÆÌåÓý

Carl,?
I really did enjoy your Facebook video of your layout! ?Thanks for sharing!
Ian


On 18 Sep 2023, at 12:10 am, Carl <carl.blum@...> wrote:

Try this link:


On 9/17/2023 9:45 AM, old_toolmaker via groups.io wrote:
Hello Carl!
I don¡¯t have a Facebook account so was unable to view your shop and railroad pictures.?
--
forum/?OFF-SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
?LARGE TURRET TOOL POST PLANS
?MINI-LATHE CARRIAGE LOCK PLANS
?SMALL QC TOOL POST PLANS?
?QUICK CHANGE LATHE TURRET
?MINI LATHE COMPOUND PIVOT MODIFICATION

Re: Headstock spindle spring

 

Well, I think Carl you are referring to lathe use. I don't use a quill spring on the Unimat I use as a lathe.

I have a separate one set up as a vertical drill press / mill. I think it would be a little awkward not having the quill spring on that machine.

Martin P.

P.S. David, to answer your other question, Emco added the quill spring probably very early 1960s. The 1963 Miniature Machining Techniques shows a quill spring in place on a cast-iron DB200. The first SL came out in 1965.

On Sunday, September 17, 2023 at 07:50:28 AM EDT, David James via groups.io <davebjames@...> wrote:


Carl,

Thank you for the feedback, so I wont be wasting any money on that.

Dave


On Sun, 17 Sept 2023 at 9:55, Carl
<carl.blum@...> wrote:

Hello David:

My 1973 Unimat came with one, and it was the first thing I took off. It is nice to have the spring return, but with the spring there is only 19mm of stroke available. Take it off and you have 25mm of stroke.

Just use the quill lever to lift the spindle up and lock it there.

Carl.

On 9/16/2023 8:24 PM, David James via groups.io wrote:
I saw a headstock spindle spring for sale on ebay. My old cast iron unimat did not have one when I got it and my manual does not show one either. Were they only on later models and are they a worthwhile addition?
I suppose they are good when using it as a drill press.

Re: Mensuration, was Re: [Unimat] What is the 'BEST' Unimat ?

 

? ? ?Although I still have a little Unimat, my Compact 5 (with milling column) gets used the most, often for altering stock fasteners for special applications.? I also found a bargain on set of EMCO collets on evilBay.? One oddity, the lathe and column require different collet holders.....

Jeff in New Hampster

On Mon, Sep 18, 2023 at 2:58?PM Martin P. via <mdupreno1=[email protected]> wrote:
That would be the Compact 5? A really nice machine. Like the Unimat 3 but a bigger work envelope.

Martin P.

On Saturday, September 16, 2023 at 06:09:21 PM EDT, Bill in OKC too via <wmrmeyers=[email protected]> wrote:


Looked at an EMCO 5" lathe in 1984, in a department store in Wiesbaden, Germany.
Bill in OKC
Re: Mensuration, was Re: [Unimat] What is the 'BEST' Unimat ?

 

I believe so, but that last time I saw it was sometime in 1996. Never managed to buy one, despite living there for five years...?

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.
Expect in one hand, expectorate in the other. See which one gets full first.



On Monday, September 18, 2023 at 01:58:05 PM CDT, Martin P. via groups.io <mdupreno1@...> wrote:


That would be the Compact 5? A really nice machine. Like the Unimat 3 but a bigger work envelope.

Martin P.

On Saturday, September 16, 2023 at 06:09:21 PM EDT, Bill in OKC too via groups.io <wmrmeyers@...> wrote:


Looked at an EMCO 5" lathe in 1984, in a department store in Wiesbaden, Germany.
Bill in OKC
Re: Mensuration, was Re: [Unimat] What is the 'BEST' Unimat ?

 

That would be the Compact 5? A really nice machine. Like the Unimat 3 but a bigger work envelope.

Martin P.

On Saturday, September 16, 2023 at 06:09:21 PM EDT, Bill in OKC too via groups.io <wmrmeyers@...> wrote:


Looked at an EMCO 5" lathe in 1984, in a department store in Wiesbaden, Germany.
Bill in OKC
Re: Off Topic measuring units

 

Carl, I might actually do that. Although I have lived in SW Florida for now these 36 years, I own (with my sister) the family home in Beaufort, and visit there often.

Martin P.

On Saturday, September 16, 2023 at 11:16:35 AM EDT, Carl <carl.blum@...> wrote:


Hello Dick:

I invite you and all the Unimat folks to visit my shop and railroad. I really enjoy sharing.

Carl.

Here is the railroad and a glimpse of the shop:

Charleston, South Carolina, USA

On 9/16/2023 8:55 AM, OldToolmaker via groups.io wrote:
Hello Carl,
I agree and that is how I operate in my home shop today. I am completely happy with that.
Dick

Re: Tips on machining pulley grooves

 

Keith, I did have another idea¡­ What I¡¯m trying to do is essentially cut an internal semi-circular (ball) shape but there is obviously no room to swing a cutter on a pivot at the edges (it would be on a ridiculously small scale anyway).

I wondered if a cutter held vertically with a simple lever to rotate it would work. Something like a cut-down, ground-down and re-shaped small boring bar (3/16 shank)?

The cutting surface would be greatly reduced, as would load on the drive train. A ¡®proper¡¯ cutter shape could be used to suit the material Arranging it could be quite simple, dropped through a block of half inch square stuff bolted into the top of the tool holder. Disc type stop with a grub screw against a flat. The issue I think would be killing excess wobble (and therefore chatter) while still allowing it to be rotated.

Feasible?
Re: Off Topic measuring units

 

I have 4" dial calipers in both systems; one has a white dial, the other black, for quick recognition.

Also a 6" with dual systems. Red pointer for inch, black for metric, or is it the other way around?

Martin P.
Re: Off Topic measuring units

 

The U.S auto industry did "metrify" eventually because of imported parts.

On Friday, September 15, 2023 at 08:29:15 PM EDT, OldToolmaker via groups.io <old_toolmaker@...> wrote:


I remember back in the fifties,sixtys and seventies the US was actively attempting to adopt the metric system and had a plan to accomplish same. However, the US could not muster up enough support from various industry factions to maintain traction. The auto industry and others bucked and consequently the attempt failed big time due to conversion costs. Somehow I lived through it all and only have a few scars to show for it. I had forgotten the debacle entirely until this discussion awakened my memory.
Dick
--

Re: Tips on machining pulley grooves

 

Whaaaat? (throws hands into air, runs to check¡­)

Phew, my U3 definitely has round section pulleys.

I realise now that round section belts run perfectly well in V grooved pulleys, which would have been considerably easier¡­ I think I must be developing some engineer¡¯s OCD (is this a good thing? I don¡¯t know¡­)

Anyway, the first pulley (the motor one) is done, thankfully without burning out the old motor.


(I knew that test spindle that I turned a while back would come in useful one day).

The old belt just?stretches, so I can use the new motor(s) to turn the next pulley, which will then be installed and used to turn the last one.


When finished it will be 1:1 gearing, as I have the PWM controller for speed.

Cutting waste out with a parting tool certainly helped, but I think this is at the limits of the U3, if not slightly beyond it. Very slow progress!
Re: Tips on machining pulley grooves

 

That's right.? My mistake.? I got mixed up (I sold my Unimat about a year ago and don't have it to look at anymore).? I think I conflated that with another small lathe I once had that DID have round grooves for round belts.

In that case, I certainly agree that a center plunge cut (or cuts) followed by angled cuts is the way to do it.? (Well, "a" way but the way I would do it.)? No forming tool approach.

Charles E. "Chuck" Kinzer

On Monday, September 18, 2023 at 12:13:17 AM PDT, Unimat Matt <matthewtay2020@...> wrote:


All of my Unimats run a round section belt in a V ???¡á?

Re: Tips on machining pulley grooves

 

All of my Unimats run a round section belt in a V ???¡á?
Re: Mensuration, was Re: [Unimat] What is the 'BEST' Unimat ?

 

When I got my first post-college job, the first paycheck went to a 40MB external hard drive, also for $600.? And that was a deal at the time.? The guy I bought it from was assembling kits (case/HD/PS/cables), not sure where he got the drives from (this was in San Jose), but I saved about $200 over the cost of a name brand drive.

-Dave

On Saturday, September 16, 2023 at 03:09:23 PM PDT, Bill in OKC too via groups.io <wmrmeyers@...> wrote:


My experience was otherwise, on the loading of cassette tapes, and my friend that used my TRS-80 to get a job at the local Tandy Computer Center said that they were a great deal faster and more reliable than paper tape, which was about the only other option at the time for amateurs. Once floppy drives became available, you would be correct. However, IIRC, the first 10mb hard drive cost way more than my computer when they came out. That computer was a Level 1, Model 1, TRS-80, with 4k of ram. For $600. That was somewhat less than two months of my pay at the time. Seems to me that the 10mb hd was several thousands of dollars. Just downloaded the March 1980 issue of Kilobaud Microcomputing. A Perscom 40-track floppy system with 1 drive was only $400. A Northstar Horizon System with an 18mb hard drive, and two floppies was $9329, and an additional 18mb HD was another $5000.

I was able to get by just fine with my cassette driver for several more years. ;)

Now, I'm using my SIL's former game machine, with a 200+gb SSD, and a 4TB hard disk... But I don't program anymore. Was never all that good at it, but did put myself online with an H-89 with CP/M, two floppies & a 300 baud modem on a TurboPascal terminal program in 1988 or 89. Fun times!

Pretty sure for what I spent on those, I could have bought a decent small lathe. Looked at an EMCO 5" lathe in 1984, in a department store in Wiesbaden, Germany. It was about $350, but I was TDY for medical purposes and couldn't cash a check large enough to get the Deutsch Marks to buy it. Pretty sure it would have fit in my suitcase! Saw it again (or one very like it) when I was stationed there in 1991, but by then it would have cost about $1000 due to the declining value of the US dollar... SWMBO had two of our 3 kids there, so no lathes for me.?

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.
Expect in one hand, expectorate in the other. See which one gets full first.



On Saturday, September 16, 2023 at 04:02:46 PM CDT, Bruce C <bruce@...> wrote:


[Even more off topic] My recollection of loading from a cassette is that it often took several attempts, and even when successful, the programmes (using the archaic British spelling) did very little of any practical value.

Bruce

On 14 Sep 2023 at 17:43, Andrei wrote:

>
> Damn, Bill. we had similar computers.
>
> My first PC was the Sinclair Z80, some 43 years ago. Has a whole 16kb
> of memory and had to load programs from a cassette tape.?
>
> https://en.wikipedia.org/wiki/ZX80
>
>
>
> ZX80 - Wikipedia
>
> en.wikipedia.org
>
>
>
>
>
>
>
>
>
> From: [email protected] <[email protected]> on behalf of Bill in OKC too
> via groups.io <wmrmeyers@...> Sent: Thursday,
> September 14, 2023 1:38 PM To: [email protected] <[email protected]>
> Subject: Mensuration, was Re: [Unimat] What is the 'BEST' Unimat ? ?
> Nope. Half an inch is 12.7mm. That two tenths of a millimeter is
> important! Sometimes! ;) I can use either system, but I'm
> math-challenged despite decades of study, so I use a calculator
> regardless. And the only time I needed to deal with 1/128" was back
> when I got my first Vernier caliper. What I hate is things that mix
> the two systems. Chevrolet vehicles, for example. BASTARDS! :) Had to
> change out the starter on my mini-van this week. Most everything on it
> is metric except the starter bolts.?
>
> Once upon a time, digital calculators were expensive. My first was a
> TI SR-51-II, and I paid $100 for it. That was about a third of my
> monthly paycheck then. When my teaching career ended, a bit over a
> decade ago, I could get a MUCH more powerful calculator for $1, with
> more scientific functions. And the TI-86 graphing calculator was going
> for about $100, then. It used a processor based on the Z-80 chip that
> ran my first appliance computer, the TRS-80 Model 1, and had the same
> graphics capability. Unlike the TRS-80, the TI-86 fit in the palm of
> my hand. Now I have a cheap Android phone, a MOTO G7 Supra. It has
> 32gigabytes of storage, and 2gigabytes of program memory. MUCH better
> graphics capability, too. I have a .5tb or 500gb micro-usb card in it
> for additional storage. And a scientific calculator app that will
> about everything BUT graphing. Including all the normal conversions.
> And another app that will display dwg files.?
>
> THERE IS NO EXCUSE FOR SUCH LACK OF PRECISION!? ;)
>
> Going through a set of drawings and trying to convert every dimension
> would be tough, though. Which means we need a means of converting on
> the fly. Digital calipers, anyone? ;)?
>
> Actually, I'll bet that if there is a method that can be used, someone
> is using it. I actually prefer to use the Imperial system, as modified
> in the USA, but can get along fine in Metric. Lived for a tad over 5
> years in Germany, and 3 in Turkey. I have bought gasoline in litres,
> and assorted foods in kilograms & grams, so I can get by.?
>
> 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. Expect in one hand,
> expectorate in the other. See which one gets full first.
>
>
>
> On Thursday, September 14, 2023 at 09:14:11 AM CDT, Andrei
> <calciu1@...> wrote:
>
>
> I was too lazy to calculate so i just threw in the closest numbers:
> 9/16 is greater than half inch. Half inch is 12.5mm so the conclusion
> was that it is bigger than those two numbers the lazy way out Andrei
>

??
Re: Tips on machining pulley grooves

 

The traditional acronym is PEBCAK: Problem Exists Between Chair and
Keyboard.


On 9/17/23 12:22 PM, Peter Brooks wrote:
On reflection, I think it was ¡®the nut between the chair and keyboard¡¯,
which makes much more sense and is closer to your definition :-)
_._,_._,_
--
Elliot Nesterman
elliot@...
www.ajoure.net

"The finest jewel cannot disguise a flawed character."
Re: Tips on machining pulley grooves

 

On Sun, Sep 17, 2023 at 12:40 AM, Mike Gidley wrote:
This what i was thinking Peter
I made a tool like this for undercutting a ring I was machining off an 8" diameter bit of aluminium - obviously it was all much bigger than a Unimat. I also cut some Vee groove pulleys on a big machine, by cutting to the bottom of the groove with a modified parting tool - a grooving tool - to take out most of the material. You could make a small tool like this from something like O1 carbon steel by drilling a recess and filing back to the round profile. You probably don't need to harden the steel for a small number of cuts like this, but you could. If you had made the pulley from brass it would have been easier, and different grades of Ali can be very different in there machinability. Best is 2011, which is leaded, and definitely cuts much more readily than many other grades. Also consider various plastics - Acetal (Delrin) cuts very nicely. Another approach would be to cut the groove with a ball nose milling cutter held in something like a Dremel in the tool post. Not sure how large a cutter you can put in a Dremel, but something like that. An old way to do it would be to put the cutter in the lathe chuck and rotate the pulley horizontally against it on the cross slide with some sort of gearing arrangement. Various possibilities if it really won't work by the direct turning approach.
Re: Tips on machining pulley grooves

 

I was not as sophisticated as any of this.? I took a 1/4" pointed nose carbide tool and cut a groove that works well enough with an O-ring.
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