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Re: is this an original minilathe
It would interesting on history of current mini lathes.??
I have a lot of info on engin lathes?
I can see a Russian need a small low cost light weight lathe for small fish boats?
If you are? on ocean and a part needs turn it would fit .?
The mini lathe gets the job done. No bells and wishlists?
When I was in? high school and college did iron work.? There was times that the mini lathe would wonderful job. All I had was a grinder and drill got job done.?
Dave?
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Bruce J
12:27pm? ?
I cannot find the site where I read this, but the modern Sieg (and Red Bull) 7X Mini lathes were originally based on a 70¡¯s era Soviet small lathe designed for cheap production.
If we¡¯re just going to go by ¡®a small bench top lathe¡¯ we¡¯ll have to go back to the beginning, like that one in the Clickspring, but what we would recognize as a ¡®modern¡¯ lathe would be Ramadan¡¯s lathe of 1775: https://en.wikipedia.org/wiki/Screw-cutting_lathe#Modern_screw-cutting_lathes_(late_18th_to_early_19th_centuries) and perfected by Henry Maudslay who arguably set the current form for a metal lathe with lead screws, cross-slide
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Re: is this an original minilathe
That why I purchased a 8" no gap on market.
Dave?
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Re: is this an original minilathe
I once toyed with cutting a gap in the 7x bed, but there isn't enough meat in the bed to do that safely.
Mike Taglieri?
On Wed, Jan 3, 2024, 4:34 PM Charles Kinzer < ckinzer@...> wrote:
And a gap bed configuration would be another alternative.? This would allow swinging (not necessarily machining to the outside diameter) of a larger disc like piece.? Usually something like a disc where you are machining a smaller feature like a shoulder or boring a hole.
It could be a removable gap piece (cheapest way) or a sliding bed to create the gap or close it.
Charles E. "Chuck" Kinzer
On Wednesday, January 3, 2024 at 01:26:56 PM PST, Miket_NYC < mctaglieri@...> wrote:
I wish someone would make "raising blocks" for the 7x minilathe the way South Bend did to make the "Large Swing" model in this article?
I realize that a bigger lathe is bigger in all dimensions and capabilities, but center height is the main area home hobbyists sometimes wish we had more of.? And owners of bigger lathes do too. Logan made this remarkable gadget to get more center height on their 11" lathe without disturbing the headstock.
As you can see, this fastened on the bed as needed moved the spindle up and to the rear, and slowed it down, connecting on the left side to the original spindle. It's a pity someone doesn't make something like this for the 7x lathe. (Any chance you're reading this,? LMS?)
Mike Taglieri?
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Re: is this an original minilathe
And a gap bed configuration would be another alternative.? This would allow swinging (not necessarily machining to the outside diameter) of a larger disc like piece.? Usually something like a disc where you are machining a smaller feature like a shoulder or boring a hole.
It could be a removable gap piece (cheapest way) or a sliding bed to create the gap or close it.
Charles E. "Chuck" Kinzer
On Wednesday, January 3, 2024 at 01:26:56 PM PST, Miket_NYC <mctaglieri@...> wrote:
I wish someone would make "raising blocks" for the 7x minilathe the way South Bend did to make the "Large Swing" model in this article?
I realize that a bigger lathe is bigger in all dimensions and capabilities, but center height is the main area home hobbyists sometimes wish we had more of.? And owners of bigger lathes do too. Logan made this remarkable gadget to get more center height on their 11" lathe without disturbing the headstock.
As you can see, this fastened on the bed as needed moved the spindle up and to the rear, and slowed it down, connecting on the left side to the original spindle. It's a pity someone doesn't make something like this for the 7x lathe. (Any chance you're reading this,? LMS?)
Mike Taglieri?
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Re: is this an original minilathe
I wish someone would make "raising blocks" for the 7x minilathe the way South Bend did to make the "Large Swing" model in this article?
I realize that a bigger lathe is bigger in all dimensions and capabilities, but center height is the main area home hobbyists sometimes wish we had more of.? And owners of bigger lathes do too. Logan made this remarkable gadget to get more center height on their 11" lathe without disturbing the headstock.
As you can see, this fastened on the bed as needed moved the spindle up and to the rear, and slowed it down, connecting on the left side to the original spindle. It's a pity someone doesn't make something like this for the 7x lathe. (Any chance you're reading this,? LMS?)
Mike Taglieri?
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Re: is this an original minilathe
I cannot find the site where I read this, but the modern Sieg (and Red Bull) 7X Mini lathes were originally based on a 70¡¯s era Soviet ?small lathe designed for cheap production.
If we¡¯re just going to go by ¡®a small bench top lathe¡¯ we¡¯ll have to go back to the beginning, like that one in the Clickspring, but what we would recognize as a ¡®modern¡¯ lathe would be Ramadan¡¯s lathe of 1775:??and perfected by Henry Maudslay who arguably set the current form for a metal lathe with lead screws, cross-slide, toolrest and change gears to enable mass production of precision threads.
Arguably the Atlas/Craftsman were the hobbyist forebears of ¡®our¡¯ current mini-lathes. There were others, the smallest South Bend lathes, and others of the 1930¡¯s era machines would also fit, like this one:?
$163 in 1929 for the smallest 9x11 is equivalent to ~$2900 today, so these were hardly ¡®hobbyist¡¯ items
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On Jan 3, 2024, at 1:01 PM, davesmith1800 <davesmith1@...> wrote:
I think looking for when name mini lathe was first used.?
You find some small athd dating back to at least the 1600's. Witch to could class of mini lathe.?
When I first saw mini lathe they where only 6" now you see then 7 and 8" but using same frame as 6"?
The one I have has been raise to 8" and you see the block in photo.?
Dave?
<rising block.jpg>
--?
Bruce Johnson
The less a man knows about how sausages and laws are made, the easier it is to steal his vote and give him botulism.
Re: is this an original minilathe
??? ??? The one that was in Clickspring's? youtube has all of
those beat .
animal
On 1/3/24 12:01 PM, davesmith1800
wrote:
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Show quoted text
I think looking for when name mini lathe
was first used.?
You find some small athd dating back to at least the 1600's. Witch
to could class of mini lathe.?
When I first saw mini lathe they where only 6" now you see then 7
and 8" but using same frame as 6"?
The one I have has been raise to 8" and you see the block in
photo.?
Dave?
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Re: LMS 5100 Lathe Bed and Headstock Modifications
Have you checked the unit price from Chinese brokers of 7x14 lathes?? ? One broker lists them at $99.00 for any quantity (yes, plus shipping- negotiable).
Anyone on this forum could QC the lathe in 10 minutes - takes longer for the paint to dry.
--
Lone Tree, Colorado? ?USA
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Re: is this an original minilathe
I think looking for when name mini lathe was first used.? You find some small athd dating back to at least the 1600's. Witch to could class of mini lathe.? When I first saw mini lathe they where only 6" now you see then 7 and 8" but using same frame as 6"? The one I have has been raise to 8" and you see the block in photo.? Dave? 
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Re: is this an original minilathe
Maybe this one?
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Show quoted text
On 1/3/2024 1:27 PM, davesmith1800 wrote: The mini lathe would date back to 1700's for gun making.
I would say it definitely a contender for modern mini lathe.
Some small lathes would need power feed as operator was foot power.? The larger lathe was run by? water and machinist was power feed.
Dave
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Re: is this an original minilathe
The mini lathe would date back to 1700's for gun making.?
I would say it definitely a contender for modern mini lathe.?
Some small lathes would need power feed as operator was foot power.? The larger lathe was run by? water and machinist was power feed.
Dave?
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Re: is this an original minilathe
I would say absolutely not.? There have been a VAST number of small lathes produced, often for watchmaking or model making purposes.
However, this does bring up the question of just what IS a "mini lathe."? I doubt there is some specific definition to distinguish it from just being a small lathe.? But I think there might be some criteria.? And also, what seems have developed in the lexicon of lathe types commercially and casually.
My opinion:
First, in the realm of metal lathes, is that it must be an "engine lathe" (which the lathe in the link is not).? This means it has a powered carriage movement at a minimum.
Second, it must be not too big nor not too small.? The "7 inch" swing seems to what the marketplace has decided upon.? (This swing dimension being diameter over the ways.? In some parts of the world, the swing is the radius at 3 1/2 inches).? Larger are usually not called "mini" and have no such prefix moniker.? Smaller are called "Micro" and smaller yet "Baby."
Third, it usually refers to one of the Chinese imports (no matter whose name is on it).? However, lathes from elsewhere, if close to the first two criteria, could reasonably also be called "mini lathes."
Woodworking lathes have a different definition for the term and tend to mean 8 to 10 inch swiing or similar small size in their world.? But those aren't metal lathes.
Charles E. "Chuck" Kinzer
On Wednesday, January 3, 2024 at 09:34:16 AM PST, fxkl47BF via groups.io <fxkl47bf@...> wrote:
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We once encountered a situation where someone HAD used a water pipe for a ground connection.? It was at a very rustic resort.? We found that the water flowing from the bathroom faucet was "hot" relative to the metal drain.? It wasn't 120V but there was enough voltage there to get your attention.? And it was due to the fact that some of the galvanized had been replaced by plastic, interrupting the ground circuit.
So it's not a theoretical possibility.? We quickly contacted the resort's maintenance folks once we discovered the problem.?
The plumber who replaced the pipe probably had no idea that it might cause a problem like that.
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Re: LMS 5100 Lathe Bed and Headstock Modifications
One of the things I learned while looking for appliances to put into our rental was that _every_ model from just about _every_ vendor had some negative reviews.? I don't think that comparing consumer-grade appliances to hobbyist-grade machine tools is a big stretch.? This is because both are very price-sensitive so the manufacturers have to manage their manufacturing so they can make money in the face of low profit margins.? The end result is a percentage of less than perfect items coming out of the manufacturing floor.? In those situations QC probably is a sampling process -- because time is money, and there isn't much to spare to make that profit margin.? So even "good" vendors will sometimes sell not-so-good product.
?
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is this an original minilathe
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Re: LMS 5100 Lathe Bed and Headstock Modifications
Since LMS is often held up as the "good" maker of these lathes, this
is... disappointing.
=----------------------
paul fox, pgf@... (arlington, ma, where it's 37.3 degrees)
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LMS 5100 Lathe Bed and Headstock Modifications
Having evaluated headstock-to-bed alignment a couple of times in the past with little success, and seemingly chasing a moving target, I abandoned the effort.
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A month or two ago I installed tapered roller bearings in the headstock.?? I was not much impressed with the bed finish under the headstock, but moved on with the headstock reinstallation.
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Recent discussions regarding machine quality reinforced my desire to beat this lathe into submission.?? Using ?¡± drill rod in the 3-jaw chuck seemed to indicate the headstock as pointing down going towards the tailstock.?? Loosening both chuck-side bolts of the headstock, and inserting 0.001 under the flat and the V did not help.
?
After more fiddling I loosened the third (last) bolt on the front-gear-train side.?? And shortly discovered the headstock can rock on an axis from the rear-chuck side to the front-gear-train side.??? The gap under the rear-chuck side of the headstock is 0.007¡± with the headstock resting of its own weight on the bed (and also with 45 pound chunk of steel on it).?? The rear flat of the headstock appears to have been machined at a slight angle ¨C or warped.
?
Shimming will be needed ¨C just to get the headstock from rocking ¨C and this is what I mean by very poor QC.?? But rather than just doing that alone (prior to any alignment efforts), I decided I want the headstock more rigidly attached.?? Especially since the area where the motor is mounted does not look very rigid.?? So I have added a fourth bolt to anchor the rear-gear-train side in a more positive manner.?? Also ordered an MT3 test bar to make things as good as possible.
?
I mentioned the condition of the bed under the headstock earlier.?? One thing noted was light surface corrosion in the area of the rear-chuck side bolt.?? I do not think the headstock was ever properly cinched down there, or in reality even possible for that to be done.?? All three bolt holes had a small bit of burrs which have been cleaned up.?? There are also a series of light scratches running through the center of the bed angled 30 degrees off the rear bed edge.??? A lot of quality and care under there.
?
Two images are in my photo section.
?
Awaiting the test bar now.?? That should be interesting-- Lone Tree, Colorado? ?USA
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Re: heavy hex gauge addition
je viens de voir? que le sit? est? sur laplaque ici
il y a tous? les tableau possible? merci
jacques 47 71
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en francais? l? il semble? que? vous me comprenez? mieux en trasuisant
j'aie vue? il me? semble ici? cette instrument? mais? il est f ait pour les grande nut
existe t'il pour les plus petites? grandeur
en plus j'aie due? prendre une capture d 'ecran? pour imprimer? le tableau
en plus? il y a plusieurs? tableau de ce genre? ici corespondance? metrique imp¨¦rial? etc
il serait interessant? de reunir? tous? cela? sous? forme? de ficher? imprimable??
jacques? 47 71
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Just a point of anecdotal data, ?I had that very thing done to my house when my ancient water line broke (underneath my concrete driveway, on July 4th weekend of course!) it was replaced with PEX. The tubing they used has a copper ground wire bonded to it just for that purpose, since connecting to the water line for the ground is so common in older houses.?
It may well be part of the code where I live to use that.?
lso you always want to break the hot side of a circuit NEVER break the neutral. That is a violation of both NEC,CE, and NFPA regulations along with UL. You also NEVER should tie a ground wire from anything to a water pipe. I know they used to do this. BUT it is no longer allowed with good reason. THINK about it. Someone comes along and replaces a section of your metal pipe with plastic. This just happens to be between your ground connection and actual point the pipes leave the building and make contact with ground. You just lost your ground. That is WHY it is NOT allowed.? Same as you always tie one side of the secondary single phase step-down transformer to chassis ground UN-fused and use it as neutral.
--? Bruce Johnson
"Wherever you go, there you are." B. Banzai, PhD
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davesmith1800