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Re: Use a center or not?
For the BEST accuracy and concentricity, you're supposed to turn between centers on a lathe. If you want the ultimate possible concentricity, you grind the centers on the lathe immediately before the job, according to all the old books on lathe work.? Funny thing, I took a class on machining a few years ago, and they did not even teach turning between centers. Of course, my class was the prerequisite for the CNC Machining class, where they don't need such things! ;) I'd also taken a course in high school, 50 years ago, and they did teach machining between centers there. My, how times change! 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! 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, July 17, 2023 at 01:08:02 PM CDT, Peter Brooks <peter@...> wrote:
I¡¯m making a kind of reference rod on my U3, with the aim of making it as concentric to the spindle as possible.
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Re: tailstock end of Unimat alloy bed...
Sounds like a good thing I finally got a follower rest for my larger lathe, since I can't seem to find M8x1 allthread. Looks like I either need 127/120 tooth change gears, or taps and dies. Also gotta check to see if the leadscrew is LH or RH threaded... Looks like I found another rabbit hole to dive down! 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! 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, July 17, 2023 at 10:17:54 AM CDT, g steinback via groups.io <gsteinba52@...> wrote:
The woodworking version was designed for hand-held tools, and as you can see there is no feed screw! Clearance may be an issue (along with many others) for anyone wishing to add extended way bars. |
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Re: SHERLINE TO UNIMAT 3 THREADING ATTACHMENT ADAPTER DRAWINGS
1. Yes, thas looking at it from the lathe side. 2. Not sure which photo you mean the Bush is threaded m16 and screws? into the backing plate? to support the shaft that drives the leadscrew. The drawing doesn't show individual thread points the same as it doesn't show gear teeth, this is a pretty standard drawing convention. 3. AF means across flats, pictures attached showing mine in its standard running configuration, one more gear is attached to the spindle and clamped with the handle, the curved slot is for the mounting bolt and the 4mm washer fits between? the machine and plate as a spacer on that bolt. Sent from From: [email protected] <[email protected]> on behalf of Peter Brooks <peter@...> Sent: Sunday, July 16, 2023 3:40:52 pm To: Mike Gidley <mike.61dley@...>; [email protected] <[email protected]> Subject: Re: [Unimat] SHERLINE TO UNIMAT 3 THREADING ATTACHMENT ADAPTER DRAWINGS I think I've just about understood the 'unimat3 threading attachmentpdf' drawing, but have a few quick queries: 1) am I right in thinking that the plate is shown upside down in the drawing, and in use is rotated 180 degrees? So that the M16 threaded hole is at the lead screw? 2) in the photo of the components on the drawing it doesn't look as though the bush is threaded - is this because it isn't done yet, or is it not necessary to do so? 3) and finally, what does 17AF mean? As noted just above the bush. Apologies for my ignorance! Thanks, Peter |
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Re: tailstock end of Unimat alloy bed...
I was aware that they were sold, but I'd never seen a Unimat except in photographs until fairly recently. I first SAW an actual Unimat about 2018 or 19, friend of mine had 4 of them for sale as a group, for $1600, was wasn't willing to sell just one. Not that I could have afforded even the $400, at the time. ;) But I saw them in the back of his van, at the Southwest Ironworks Wood and Metalworker's Swapmeet and Faire. First laid hands on one in December of 2021, I guess it was.? The rails I made for my SL were about as long as the ones in the photo at Tony's Lathes site, but I didn't like the ends sticking out and just hanging in the air. That was 300mm length 12mm linear guide rod. So I shortened them to stock length for the standard ways. but I was in the mini-lathe crowd for more than a decade, and had wanted to modify my HF 7x10 quite a bit. Didn't actually do much with it, as I found a Atlas TH42, which is about double the capacity of the 7x10. And while the 7x10 was only around 115lbs, the 10x24 TH42 was closer to 270lbs. That is good for some things, but it's not very portable! ;) Extended way bars will reduce the portability a bit, but it won't be that much heavier even with the bed extension. A stock machine without a lot of accessories, and in the original box, weighs about 25lbs. I would not have cut down a bed to do this project, but I knew about a couple of folks who had, and one was willing to sell me his remnant for a reasonable cost.?? Had to do yardwork this morning, first thing, but working on the shop in on the calendar now that the grass is a bit shorter. It's been raining off and on the past couple of weeks, and the grass was getting rather tall, and we're expecting more rain this afternoon or evening... And temps in the 90's, so didn't want to wait on it.? 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! 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 Sunday, July 16, 2023 at 08:40:49 AM CDT, Jkle379184 via groups.io <jkle379184@...> wrote:
Interesting Unimat used to sell extended beds rails. this is from the lathe site?? "
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Re: tailstock end of Unimat alloy bed...
¿ªÔÆÌåÓýHi Gang: I thought of raising the headstock and making a spacer to add extra rails and extend the possible length:
If you used another bed casting the extended ways could have a second carriage! Never did anything, I have larger lathes. Carl. On 7/16/2023 9:40 AM, Jkle379184 via
groups.io wrote:
Interesting Unimat used to sell extended beds rails. this is from the lathe site?? |
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Re: tailstock end of Unimat alloy bed...
Interesting Unimat used to sell extended beds rails. this is from the lathe site??
"
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Re: Question for you guys that are tech savvy
I have some of Dougs belts and also some from Toms Tool Store. Both are great quality. I bought the O ring first and experimented with each one, All worked great. I was hoping the the O rings would slip a bit if needed to act as a safety feature, I would rather have them slip then break something else. So far no slippage and they are easy to put on and remove. I have several Unimats and since I converted two of them to the 24vdc motors years ago, I rarely change belts. I also remove the belts when not using the lathes. I have inclosed a photo of the earlier belts that Unimat used. ?Jeff
On Saturday, July 15, 2023 at 12:17:06 PM EDT, Jkle379184 via groups.io <jkle379184@...> wrote:
I have some of the very old OEM ones, they used two different types, one was a twisted "fibre" tope like and the other was a similar to a mini V belt. The mini V belts look like a O ring and are rounded on the top, but they have a slight flat sides to form a V on the inside.? Jeff
On Saturday, July 15, 2023 at 11:58:29 AM EDT, Charles Kinzer <ckinzer@...> wrote:
I got belts from Doug Feistamel at his site at At the bottom of his home page, he describes his belts in detail saying they are polyurethane.? They happen to be orange, but it should be noted that the "industry standard" for O-Ring colors is not a hard and fast rule.? And the ones from Unimat-Vintage-Lathe don't seem to be a standard O-Ring anyway but a purpose designed belt that happens to look just like an O-Ring. I consider these to be top quality belts. I used to design instrumentation for deep ocean applications and used many O-Rings for sealing purposes.? There are many materials and "durometers" (hardness) and there are plenty that would not be suitable for a Unimat drive belt.? So, if you just buy some O-Ring, it might or might not be suitable. Charles E. "Chuck" Kinzer
On Saturday, July 15, 2023 at 08:21:10 AM PDT, Jkle379184 via groups.io <jkle379184@...> wrote:
Ok, I am on a learning curve right now. It looks like the color is important, the industry uses the color of the O ring as a code to tell what it is made of. I got lucky years ago when I ordered the white ones. Here is a link to what the colors mean. And here is data on the white ones that I have If you do a web search of -334 or -339 Oring 70 Duro White FDA NBR you will find many sources for them. Here is a data link for the black ones Jeff
On Saturday, July 15, 2023 at 10:24:49 AM EDT, Jkle379184 via groups.io <jkle379184@...> wrote:
I got them on Ebay a few years ago, they are? a standard size O ring. I will check my notes to see if I wrote down the O ring sizes. ?Jeff
On Saturday, July 15, 2023 at 09:23:12 AM EDT, OldToolmaker via groups.io <old_toolmaker@...> wrote:
Hello Jeff, Where do you purchase your white buna belts? Dick -- http://www.homemadetools.net/ 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 |
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Re: Question for you guys that are tech savvy
I have some of the very old OEM ones, they used two different types, one was a twisted "fibre" tope like and the other was a similar to a mini V belt. The mini V belts look like a O ring and are rounded on the top, but they have a slight flat sides to form a V on the inside.? Jeff
On Saturday, July 15, 2023 at 11:58:29 AM EDT, Charles Kinzer <ckinzer@...> wrote:
I got belts from Doug Feistamel at his site at At the bottom of his home page, he describes his belts in detail saying they are polyurethane.? They happen to be orange, but it should be noted that the "industry standard" for O-Ring colors is not a hard and fast rule.? And the ones from Unimat-Vintage-Lathe don't seem to be a standard O-Ring anyway but a purpose designed belt that happens to look just like an O-Ring. I consider these to be top quality belts. I used to design instrumentation for deep ocean applications and used many O-Rings for sealing purposes.? There are many materials and "durometers" (hardness) and there are plenty that would not be suitable for a Unimat drive belt.? So, if you just buy some O-Ring, it might or might not be suitable. Charles E. "Chuck" Kinzer
On Saturday, July 15, 2023 at 08:21:10 AM PDT, Jkle379184 via groups.io <jkle379184@...> wrote:
Ok, I am on a learning curve right now. It looks like the color is important, the industry uses the color of the O ring as a code to tell what it is made of. I got lucky years ago when I ordered the white ones. Here is a link to what the colors mean. And here is data on the white ones that I have If you do a web search of -334 or -339 Oring 70 Duro White FDA NBR you will find many sources for them. Here is a data link for the black ones Jeff
On Saturday, July 15, 2023 at 10:24:49 AM EDT, Jkle379184 via groups.io <jkle379184@...> wrote:
I got them on Ebay a few years ago, they are? a standard size O ring. I will check my notes to see if I wrote down the O ring sizes. ?Jeff
On Saturday, July 15, 2023 at 09:23:12 AM EDT, OldToolmaker via groups.io <old_toolmaker@...> wrote:
Hello Jeff, Where do you purchase your white buna belts? Dick -- http://www.homemadetools.net/ 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 |
Bill in OKC too
Carl
