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Re: Unimat 3 - replacing/making new gibs
Alexander noname
i done a set of brass stripes and gibs. .yes t would give you more stability Bill in OKC too via <wmrmeyers=[email protected]> schrieb am So., 10. Juli 2022, 06:32:
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Re: Unimat 3 - replacing/making new gibs
Steel gibs are perfectly fine on cast iron ways.? I don't know what your U3 is made of. If it's? cast iron, steel would be good. If it's steel, cast iron would be good. Brass would be fairly good for either iron or steel ways You might be able to fake it long enough to make better gibs in either of the preferred metals with aluminum or plastic gibs the U3 temporarily.? ?Depending on your long term needs you might get by fine with plastic or aluminum while you source better materials even if it takes years. There are harder plastics, too, though some are considered obsolete, like Bakelite that could wore well, or Mikarta.? 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
On Saturday, July 9, 2022 at 12:25:01 PM CDT, sawbona@... <sawbona@...> wrote:
Hello: I am in need of replacing the gib on my U3's top slide (part 150.190) as it came with a non-OEM of dubious design. The original plastic/fiber molded (?) gibs on the carriage and the cross feed also seem to be in need of replacement. The first one because it is made of steel, not the best material for a gib. The others because of their age but not only that: I am finding there seems to be a lack of rigidity in the cross slide as I practise turning of soft steel. eg: a slow thin surface cut at low speed will cut going in but also coming out. I have looked all over for a source for these parts (unsurprisingly to no avail) but I have not found an article or information on how to go about making a new set either.? I'm sure that the choice of materials, method, geometry, critical dimesions, etc. are of the utmost importance. I did find a couple of photos posted on a German site but only for reference to what had to be done to make the Unimat 3 stay in line, so to speak: The adjustment bar of the cross slide is made of plastic, not very stable and sensitive.
A small brass strip (see arrow) fixes the problem.
The guide rails of the bed slide are also made of plastic and are too unstable.
Under (low) load, the bed slide twists minimally on the guide prism resulting in an inaccurate turning result.
At least one of these plastic strips should be replaced by an exactly fitting one brass strip to be replaced.
Q: Has any member made a new set of gibs for their Unimat/s? If so, I'd appreciate some input on how to go about it. Thanks in advance. Best, JHM |
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Re: Milling with the DB 200
¿ªÔÆÌåÓýHello Slynch: This is
one weak feature of the Unimat. There is no graduations for
vertical movement. You can move the quill and not loose
location, which you would loose if you moved the milling head.
You could use an indicator to watch how much the quill moves.
Take small cuts, it isn't a heavy duty machine. Carl. On 7/9/2022 9:03 PM, slynch wrote:
I'm fairly new with the DB 200, and I'm trying to figure out how you mill with it. I can see the X-Y movement with the milling table attached to the cross-slide, but how do you accurately control the vertical cut depth ? I don't see any kind of a fine depth of cut adjustment, or do you re-adjust the milling head on the vertical shaft every depth change ? |
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Re: Milling with the DB 200
Kevin Groenke @ PersonMakeObject
Z-axis in milling set-up is a significant problem. When I do it I use the quill feed on the headstock but accuracy is not inherent. There are some Unis with an aftermarket z-axis feed mechanism out there, but they're pretty rare. Search the group for "UPVLA" for previous discussion of it.? Kevin from PersonMakeObject On Sat, Jul 9, 2022, 8:03 PM slynch <seanlynch40@...> wrote: I'm fairly new with the DB 200, and I'm trying to figure out how you mill with it. I can see the X-Y movement with the milling table attached to the cross-slide, but how do you accurately control the vertical cut depth ? I don't see any kind of a fine depth of cut adjustment, or do you re-adjust the milling head on the vertical shaft every depth change ? |
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Unimat 3 - replacing/making new gibs
Hello:
I am in need of replacing the gib on my U3's top slide (part 150.190) as it came with a non-OEM of dubious design. The original plastic/fiber molded (?) gibs on the carriage and the cross feed also seem to be in need of replacement. The first one because it is made of steel, not the best material for a gib. The others because of their age but not only that: I am finding there seems to be a lack of rigidity in the cross slide as I practise turning of soft steel. eg: a slow thin surface cut at low speed will cut going in but also coming out. I have looked all over for a source for these parts (unsurprisingly to no avail) but I have not found an article or information on how to go about making a new set either.? I'm sure that the choice of materials, method, geometry, critical dimesions, etc. are of the utmost importance. I did find a couple of photos posted on a German site but only for reference to what had to be done to make the Unimat 3 stay in line, so to speak: The adjustment bar of the cross slide is made of plastic, not very stable and sensitive.
A small brass strip (see arrow) fixes the problem.
The guide rails of the bed slide are also made of plastic and are too unstable.
Under (low) load, the bed slide twists minimally on the guide prism resulting in an inaccurate turning result.
At least one of these plastic strips should be replaced by an exactly fitting one brass strip to be replaced.
Q: Has any member made a new set of gibs for their Unimat/s? If so, I'd appreciate some input on how to go about it. Thanks in advance. Best, JHM |
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Re: Damaged thread woes
Hello:
I don't recognise this as any part of a U3, nor can I find it in any of the drawings ... It may not be in the manual, it is not in my (incomplete) copy. This is from the HobbyProducts_(NeilsCompressed).pdf file we have here. On Thu, Jul 7, 2022 at 08:33 PM, Keith S. Angus wrote: The M3 screws don't bite because the holes are for M4.The part you are seeing in p.6 is the complete tool holder assembly which indeed has M4x16 DIN 5535.8 screws But it is not the part I am referring to. This part takes the place of the tool post and can change the angle of attack. Nevertheless, there seems to be more than one version of this part. This is the one I have: Notice the tool holder has four screws instead of one to hold the tool in each possible orientation. This is one just like it, fetched from the web: Having two screws to hold a tool allows for playing with height/angle. Then there's the version from the *.pdf file: It has M3 holes threaded for M3x0.50. Why didn't they use M4 screws like in the tool post slide? 8^#%$! ... Thanks for your input. Best, JHM |
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Re: Damaged thread woes
Hello:
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On Thu, Jul 7, 2022 at 05:41 PM, John Hutnick wrote: If there is enough material ...Ahh ... A huuuuge if. This is the view of the holes as they are. You can easily make out that they are not the same distance from the way. Here's a sketch with the measurements. Please excuse the untidiness. 8^/ I gave the piece a thorough scrubbing with a toothbrush and degreaser to measure it. I was not able to find that same discrepancy (0.2mm) by measuring the distance from the way to where the tool is held. So I think the discrepancy can only be due to careless machining on behalf of Emco/Unimat. Having at most 1.2mm to bite into, an M3.50x0.60 tap will do away with 0.25mm and leave a tad less than 1.0 mm. to the way. I don't really think there's much room for anything else. If it wasn't that these thinguies cost way too much for what they are ... Thanks for your input. Best, JHM |
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Damaged thread woes
Hello:
Still getting acquainted with my U3 and finding things. ie: carelessness on behalf of its previous owner/s. For another sample, see Turns out that the threads (M3x0.5) for adjusting the gib on the top slide (part 150.190) are stripped. Both of them, albeit one of them still holds a bit. When I saw the screws and realised they were not the original ones, I went out and purchased a set of new (slot head) ones but one of them will not hold. My Greenfield M3x0.50 tap can be jiggled once placed in the holes so ...? 8^/ I have a M3.5x0.60 tap but will have to make do with round head Phillips screws as that thread is not available in other formats where I get them. Not a problem per se and guess I could make do till I find or send for a a few. And then the gib is another issue to tend to. It seems to me that there is not enough material for drilling and tapping to M4x0.70 so that's about it. Before I do anything, I'd appreciate opinions from those with the necessary experience to deal with this type of thing. Thanks in advance. Best, JHM |
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Re: Mert Baker's passing
Hi? Vicki, My sincere condolences,? he will be sorely missed by many and this group for sure.? An old world gentleman, who having acquired a great deal of experience and skill, was very willing to share. He did so freely and succinctly. He posted with humour that came from a deep knowledge and understanding. I, for one missed his pithy posts. He would wait as a thread developed and then add his two pennies worth. We would wait for that to happen and then take those thoughts and advice to build into our practice. May he rest in peace, calm seas an light winds. James? Ex RN Tiffy. On Wed, 6 Jul 2022, 05:27 Bill in OKC too via , <wmrmeyers=[email protected]> wrote:
--
James Batchelor? Dunfermline, Fife, UK.? 07805 207238 |
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Re: Mert Baker's passing
Vicky, I first "met" your dad online in the 7x10mini-lathe group, and it's successors. Followed him on the Unimat group and some others, as well. I'd been doing hobby metalworking of one sort an another for 35 years before I finally laid hands on a 7x10 mini-lathe, and he provided me with an enormous store of information on machining, metalworking, gunsmithing, and other things that I wanted to know about. He could explain things in a few sentences, or even just a few word, that would take many others pages and pages, and still not be so clear and helpful! I'd always hoped that someday I'd get to meet in in person, but that I'm not going to get to, now, is something I'll always regret. H was happy to share his knowledge, and help people begin to approach his skill level in these hobbies, and I will always remember his kindness and willingness to share! He's really high in my top-10 list of people I want to be like when I grow up! He will be severely missed!? 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
On Tuesday, July 5, 2022 at 03:32:03 PM CDT, Mert Baker <mert616baker@...> wrote:
Dear Unimat Friends of My Dad-- I am sorry to report that Dad died on 25 May. I just want to let you know that even though he had given up on being online, and in the last year had stopped tinkering with his Unimat, he still very much appreciated this community and your friendship to the end of his life. Here is a link to his obituary. I am building a memory book, so if you reply with a favorite memory to this thread, I'll print it and add it to the book. Take care, be well, and wishing all of you all the best, Vicki Baker (Mert's daughter) |
Bill in OKC too
Carl
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Dave W
James Batchelor