Here is a list of all the postings Andrew F in Australia has made in our forums. Click on a thread name to jump to the thread.
Thread: Emco Unimat 3 Threading tool |
29/12/2022 19:49:49 |
Posted by Brian G on 29/12/2022 11:45:17:
Hi Andrew Are you aware of the Unimat groups on groups.io? The biggest is groups.io/g/Unimat which is nominally for DB/SL models but has a lot of U3 owners, whilst groups.io/g/Unimat3 is smaller but just for the 3. Both groups are public so you can "try before you buy". This post looks particularly relevant to your needs, being a way to fit screw cutting gears to a U3. If you have access to a 3D printer you could create the necessary gears in Fusion 360. Brian G Thanks Brian, The back gearing post is excellent. A |
Thread: Emco Unimat 3 - Instruction manual, parts list and "miniature machining techniques" |
29/12/2022 19:42:22 |
Hi all, Bit of digging found these - https://emco.or.at/index.php/download/emco-bedienungs-und-serviceanleitungen/drehmaschinen/45-emco-unimat-3-en/file http://www.vapeuretmodelesavapeur.com/telechargements/emco-unimat-3-vue-des-composants.pdf https://archive.org/details/american-edelstaal-22637 Most emco manuals here -> https://emco.or.at/index.php/download/emco-bedienungs-und-serviceanleitungen/drehmaschinen Might help. A Edited By Andrew F in Australia on 29/12/2022 19:44:37 |
Thread: Emco Unimat Spare part seller=== |
29/12/2022 11:02:23 |
Hi admin, Have a link farm of ~15 suppliers gathered off the internet for EMCO unimat spares. Is it acceptable to post? If so, please put this link up and reply to confirm it's OK. With best regards, A |
Thread: Emco Unimat 3 Threading tool |
29/12/2022 10:57:33 |
Thanks DC3ik, Am going to look it up. Really appreciate the time you spent on this. Regards, A |
28/12/2022 10:34:48 |
Posted by JasonB on 28/12/2022 10:05:36:
As John says if you have the ELS then best to use that as you won't find dies right hand to cut M3 x 1 in any profile let alone left hand as it's a very coarse pitch, standard for M3 is 0.5mm pitch. Even with an ELS M3 x 1 on M3 stock particularly ACME will be a real challenge as the minor diameter is going to be very small and weak. Should that be trapizoidal rather than ACME form as you are using metric sizes? Thanks John. Yep Jason. My error. I've got a heavily (axially) loaded shaft. Trapezoidal will be better as you say, it's metric standard. I thought of this after posting, and was just mulling over the design as you replied. 1mm minor diameter is lunacy. Biggest issue is going to be grinding the internal thread cutter for a small dia internal thread to match the external thread, then cutting it. A square acme thread was my call there as 90° is easier to grind. Ease of use vs ease of manufacture. Still finalising design issues on this one. My biggest concern is that I've got to make this in spare time for delivery in 3 weeks, with the lathe arriving 3 Jan. It'll be tight. You've all given confidence that I can use the electronic feed to cut this, having not seen the machine yet. Thanks. Will post results. Edited By Andrew F in Australia on 28/12/2022 10:37:39 |
28/12/2022 08:55:07 |
Posted by Martin Connelly on 28/12/2022 08:11:49:
The easiest option if you only have a small number of thread sizes you plan to do is buy some suitable dies and make a tailstock die holder. There are plenty of plans and videos on this tool. I don't know if a Unimat threading attachment allows left hand thread cutting. If it does not then once again a tailstock die holder with a suitable die would be the best option. The other options of going down the ELS or full CNC route would probably be overkill for this small lathe with a small, specific, need. I have a friend who does restoration work on music boxes with a Unimat and this is his method. Anything bigger or odd I do for him. Martin C Thanks Martin. The dies and tap are expensive (acme M3 x 1 or standard M3 x 1) but it's in the back pocket as a last resort. I was using tailstocks in 4' lathes to cut threads with a die in the early 80's. Might have the wrong machine here and may need to bite the bullet on a CNC or back geared lathe. If I read correctly, are you saying that your friend cuts simple threads with a tap/die and outsources complicated ones to a machine shop? A
Regards, A |
28/12/2022 08:12:35 |
Posted by JasonB on 28/12/2022 07:56:45:
Just keep an eye out on e-bay though the threading attachments Also look in at Neils machines A tailstock die holder would probably do most of your needs unless they are non standard pitches for a given diameter. I don't think they ever did left hand guides but I suppose you could get someone with a larger screwcutting lathe to make you some and matching followers once you find an attachment. Also worth noting that the finest pitch they did the metric guide sin was 0.5mm I seem to remember seeing a couple of geared screwcutting designs for the U3 over the years which may be something to think about or even an small electronic lead screw Edited By JasonB on 28/12/2022 07:58:27 Thanks Jason. It's got an electronic lead screw, so was thinking of having a go at it that way too. (Great minds or fools....) I'll look into the geared designs, hadn't thought about that. I'm thinking the cheapest option is a tiny 'optimum type lathe second hand with back gearing, but space is a challenge. Was thinking about cutting the LH thread with the feedscrew in reverse. Need to have a close look at the machine first. Appreciate the time you took and the reply, as well as any other advice you or others may have. A |
28/12/2022 07:58:52 |
Couldn't edit the above with apologies. Did a thorough forum search before posting. Came across nielsworkshop and penny-farthing.co.uk. Any others? A |
28/12/2022 06:10:15 |
Hi all, Is there a source for second-hand bits and pieces for this lathe? At the moment, I'm looking for a threading kit in metric (preferably) as well as a dividing head.
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Thread: Unimat 3 dividing head |
28/12/2022 05:12:03 |
Hi, Sorry - new member with a question reviving an old thread. The machine I just bought is one of the 'newer' Unimat3 machines - Just enquiring in case I find one of the older indexing heads in my travels. Thanks in advance. A |
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