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Re: Unimat 3 power feed attachment (#150.300) modification
#U3accesory
#unimat3
开云体育Here’s a photo of the fellows X axis. I don’t think it’s that big a project.? Just so many other things on the go. ? From: [email protected] [mailto:[email protected]] On Behalf Of John Dammeyer
Sent: November 27, 2024 10:20 AM To: [email protected]; mkarliner@... Subject: Re: [Unimat] Unimat 3 power feed attachment (#150.300) modification #U3accesory #unimat3 ? I went as far as adding a slotted disk to the spindle for my ELS.?
But with both a homebuilt Gingery Lathe and a Southbend outfitted with my ELS I’ve never really needed to thread with the Unimat.? And the one thing my ELS requires is a reasonably rock solid spindle speed which my ELS doesn’t have.? So the plan was to first add a bigger motor and then toothed belt to the Z axis like the photo of a Unimat I found online. ? The Sherline did have adequate motor speed and a friend made good use of the ELS on his unit. Since I still have about 80 ELS kits left I guess I should assemble another one and add a stepper motor to the Z axis. John ? From: [email protected] [mailto:[email protected]] On Behalf Of Michael Karliner via groups.io ? I've been thinking about a stepper motor based power feed for the Unimat for a while. I'm also thinking about a second stage of the project to make a full electronic gearbox by putting a rotary encoder on the headstock to track rotation. ? Are the group as a whole interested in me working on this and releasing the electronic and physical designs? of you are interested. ? Basically, a standard NEMA 17 stepper should be able to drive the leadscrew, and I can print a coupler out of flexible filament for minimum backlash, together with a mount mount design to go on the baseboard. There are a few options for rotary encoders, and a modern microcontroller like a Raspberry Pi Pico should be good for speeds up to say 600 rpm. ? For those who don't have access to 3D printers and the like, I may be able to make partial kits. ? Thoughts, comments? ? Mike |
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Re: Unimat 3 power feed attachment (#150.300) modification
#U3accesory
#unimat3
开云体育I went as far as adding a slotted disk to the spindle for my ELS.?
But with both a homebuilt Gingery Lathe and a Southbend outfitted with my ELS I’ve never really needed to thread with the Unimat.? And the one thing my ELS requires is a reasonably rock solid spindle speed which my ELS doesn’t have.? So the plan was to first add a bigger motor and then toothed belt to the Z axis like the photo of a Unimat I found online. ? The Sherline did have adequate motor speed and a friend made good use of the ELS on his unit. Since I still have about 80 ELS kits left I guess I should assemble another one and add a stepper motor to the X axis. John ? From: [email protected] [mailto:[email protected]] On Behalf Of Michael Karliner via groups.io
Sent: November 27, 2024 7:10 AM To: simon mills; [email protected] Subject: Re: [Unimat] Unimat 3 power feed attachment (#150.300) modification #U3accesory #unimat3 ? I've been thinking about a stepper motor based power feed for the Unimat for a while. I'm also thinking about a second stage of the project to make a full electronic gearbox by putting a rotary encoder on the headstock to track rotation. ? Are the group as a whole interested in me working on this and releasing the electronic and physical designs? of you are interested. ? Basically, a standard NEMA 17 stepper should be able to drive the leadscrew, and I can print a coupler out of flexible filament for minimum backlash, together with a mount mount design to go on the baseboard. There are a few options for rotary encoders, and a modern microcontroller like a Raspberry Pi Pico should be good for speeds up to say 600 rpm. ? For those who don't have access to 3D printers and the like, I may be able to make partial kits. ? Thoughts, comments? ? Mike |
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Re: Unimat 3 power feed attachment (#150.300) modification
#U3accesory
#unimat3
Do you think this type of setup could be made accurate enough to single=point thread? On Wed, Nov 27, 2024 at 10:09?AM Michael Karliner via <mkarliner=[email protected]> wrote:
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Phillip Chivers Ogletree & Chivers Land Surveyors |
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Re: Triangular Gib Key For Unimat Vertical Column
Hello:
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On Wed, Nov 27, 2024 at 06:10 AM, Julius Henry Marx wrote:
I have always been in awe of that design.Recalled having once come across a post making reference to a *.pdf posted at Model-Engineer and found it again. Can be downloaded .
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It is a very interesting and comprehensive article on W.D. Urwick's Metal Master Machine with a great many detailed drawings, including a cross section of the column / triangular key arrangement on p. 16/52 and the ingenious method for actually milling the key on p. 22/52
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Bear in mind that the column is 3.50" in diameter with the key being 5" long with with 0.75" adjacent sides.
See the attached photohgraph*.
*Image courtesy model-engineer.co.uk
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Could this be implemented on the Unimat 3?
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Best,
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JHM |
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Re: Triangular Gib Key For Unimat Vertical Column
Hello:
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I have always been in awe of that design.
It is the lathe I would have wanted to purchase.
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See for an article with a full description and designer comments at lathes.co.uk.
Indeed it was and still is.
Curiously, I have not seen it implemented or made reference to anywhere else.
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From the lathes.co.uk article:
Attached is a sketch* copied from of the original patent.
* Image courtesy of lathes.co.uk?
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In my opinion, the lack of any sort of guide in the U3's mounting column (all the Unimats actually) is one its most annoying 'features'.
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While looking for a solution to this problem, I once found a video of a chap in the UK taking on a similar modification by making a rectangular slot where a snub nosed machine screw would run the length of the milling column.
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In my estimate, it will put you in the ballpark, but I do not think it provides the accuracy the triangular gib design can provide.
If interested, look for a YouTube video from a place called "Many lathes" or something such.
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Undertaking such a modification, be it the triangular gib or the one in the video requires an accurate and robust milling machine plus the knowledge to do it right lest you screw up a perfectly good column or get very little in return for your efforts.
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In my case, unless I can find a machine shop willing to undertake the task (for a reasonable amount of $) it is bucket list material.
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That said, I'd also be interested in photos / discussion about what and how you've done this.
As I do not have a milling machine, it would be of great help for when and if I can get someone to do this job.
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Best,
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JHM |
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Re: Unimat 3 power feed attachment (#150.300) modification
#U3accesory
#unimat3
Mike, Looks very similar to the discontinued Sherline power feed (P/N 3001) except the Sherline is not reversible. Instructions are still available on the Sherline website and give useful information. Regards Simon (a U4 and Sherline owner)
On Wednesday 27 November 2024 at 01:32:19 GMT, Mike Gidley via groups.io <mike.61dley@...> wrote:
This is my way of having a power feed on my Uni3.
I found a small 24v motor with a 600:1 gearbox ratio. I made a variable powersupply "1.25v to 30v" and i can get the speed down to 19 revs per minute. It is reversable with an on off on switch. It connects directly with the lead screw with a simple slot in an aluminum adaptor. I simply slide it to the left when not in use. P.S. I have no idea where the 24v motor comes from.
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Re: Triangular Gib Key For Unimat Vertical Column
I've been interested in his MetalMaster for years, but wasn't (probably still am not) machinist enough to make it work. I'd be interested in photos and discussion about what and how you've done this.? 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 Tuesday, November 26, 2024 at 09:06:50 PM CST, OldToolmaker via groups.io <old_toolmaker@...> wrote:
A few years ago I became interested in David Urwick’s triangular gib key for use on my Unimat vertical column to maintain rotational position when raising or lowering the head.
It has bean a great help to me as rotational position can now be fixed while raising or lowering the head. An example of its use is when a long slot must be cut in a vertical column. I have had this requirement on several occasions and now I have a means of doing just that.
Maybe others can benefit from this also.
Dick
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?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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Triangular Gib Key For Unimat Vertical Column
A few years ago I became interested in David Urwick’s triangular gib key for use on my Unimat vertical column to maintain rotational position when raising or lowering the head.
It has bean a great help to me as rotational position can now be fixed while raising or lowering the head. An example of its use is when a long slot must be cut in a vertical column. I have had this requirement on several occasions and now I have a means of doing just that.
Maybe others can benefit from this also.
Dick
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http://www.homemadetools.net/ ?SMALL TURRET TOOL POST PLANS? ?LARGE TURRET TOOL POST PLANS ?MINI- ?SMALL QC TOOL POST PLANS? ?QUICK CHANGE LATHE TURRET ?MINI LATHE COMPOUND PIVOT MODIFICATION |
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Re: Is it possible to separate Unimat3 from SL/DB
Can you explain what a hashtag is. I don’t think I have ever heard of it. I might be able to learn something.
Thanks
Dick
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Re: Unimat 3 power feed attachment (#150.300) modification
#U3accesory
#unimat3
This is my way of having a power feed on my Uni3.
I found a small 24v motor with a 600:1 gearbox ratio. I made a variable powersupply "1.25v to 30v" and i can get the speed down to 19 revs per minute. It is reversable with an on off on switch. It connects directly with the lead screw with a simple slot in an aluminum adaptor. I simply slide it to the left when not in use. P.S. I have no idea where the 24v motor comes from.
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Re: Is it possible to separate Unimat3 from SL/DB
开云体育Ditto. There is always something to be learned.?Best Regards John On Nov 26, 2024, at 8:48?AM, Jkle379184 via groups.io <jkle379184@...> wrote:
? I also do not have a problem with keeping it as is. most postings will list what model it is for anyways. And many of the postings are about using the lathes and that can apply to both models. ?Jeff
On Tuesday, November 26, 2024 at 07:42:49 AM EST, Julius Henry Marx via groups.io <sawbona@...> wrote:
Hello:
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@James
@Alan @Peter a
@Andrei
@Peter B
I am also a late comer, at least in comparison with the people who have been around since the Yahoo days.
That said, as a Unimat 3 owner I fully agree with the quoted opinions, to which I would like to add mine for the board member's consideration:
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Keeping a bulletin board working and in order takes work, work that is usually not seen and most times not appreciated.
It requires dedication, patience, a great deal of common sense and a cool head.
ie: the stuff that usually comes with life experience.
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I say that both as a member/former member of many groups I have benefited from / contributed to since ~1996.?
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Dividing the Unimat group will only add more work to what is needed now to keep it running.
ie: just the sharing out posts into different categories would be a mammoth sized task.
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In my view, the nature of (what we could call) the Unimat ecosystem is not a very populated one, the main reason being that Unimats (of the type we deal with here) are no longer manufactured and as a result have a steadily decreasing user base.
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I think that it's closest cousin (Sieg C0) is no longer manufactured as a unit either, but I am not sure.
Quite a few Sieg C0 parts are still available and will fit perfectly well in the U3 but with prices close/equal to Emco U3 prices. ?
eg: carriage screw replacement
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It is inevitable that the number of Unimat users / contributors to this board will eventually get to the point of being too few to justify its existence.
Just look at the statistics cited in the post by @Peter ashby.
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I believe there is strength in numbers so I'd say that we should try to make the best of that.
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One thing I would like to suggest:
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From what I gather, the Unimat 3 group is all but dead in the water, don't know what happened to the (!) Unimat3 group.
Being a moderated group, there have been no new postings to Unimat 3 for the longest while.
They are stuck somewhere, awaiting moderation from an inexistent moderator.
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Unimat group management might want to consider contacting groups.io management (must be someone to talk to somewhere) to see if all posts Unimat 3 group can be moved to the Unimat group and then close it down for lack of activity.
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Best,
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JHM
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Unimat 3 power feed attachment (#150.300) modification
#U3accesory
#unimat3
Hello:
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This is a (sort of) followup to this post.
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I went looking and found what I had started working on (more than a year or so ago) while I waited for parts and assorted tools to continue with my U3's much needed rework, which is still in progress. Like a visit to your odontologist: you know when go in but not when you'll leave.
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What I had in mind was using the existing OEM accesory (that expensive little thingy ... ) but driven by an independent 12/24v DC motor with fwd/rev PWM control. A simple solution to the 'twirl around the handle' hassle involved in moving the carriage away when not turning with a tool.
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It would still use a belt (preferably round) but it would be of a larger size and section so it would (hopefully) not stretch or slip like the OEM spec o'rings used from the factory.
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The photos attached are just a proof of concept, a general idea to improve upon and share with the board.
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Notes:
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1.
The mounting plate for this mock up was made from scrap galvanised steel sheet.
The original one will be replaced with a larger one made from 4 or 5mm laser cut steel plate.
The final dimensions and shape of the new mounting plate will become clear when I know what the driving pulley looks like and the exact motor used.
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2.
This U3 accessory is notoriously difficult to take apart to clean and grease.
If you plan on taking it apart, have a close look at the exploded view I am attaching (from the U3 manual).
There are a few things that will be lost if you don't. eg: parts 9, 10 and 11
Don't ask me how I know that.
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3.
You may notice that the hole through which the knurled knob used to engage / disengage the power feed has been enlarged.
It has been done so that it can pass through the mounting plate by just undoing three screws.
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This is needed to be able to take the mechanism apart without having to remove a pin to then remove the knob to then remove the shaft and so on.
ie: to avoid all the hassle involved.
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But don't look for it in the exploded parts diagramme as it is not numbered.
You can see it to the left of the gear in the main axle.?
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Eventually, a thin rubber/silicone something can be put in place between the gear and the mounting plate if grease starts to come out while in use.
But if hard white/yellow grease (B&D power drill gear stuff) is used, it should not happen.
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Comments / suggestions welcome.
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Best,
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JHM |
URGRA
Bill in OKC too
OldToolmaker
John Entwistle
