AndyID Posted February 6, 2021 Share Posted February 6, 2021 I thought I'd solve the problem by buying 5C clollets and one of those collet chucks. I didn't. The work is held much too far from the headstock bearings on my 9" lathe. I never use the things. Link to post Share on other sites More sharing options...
Giles Posted February 7, 2021 Share Posted February 7, 2021 My ER16 arrangement is reasonably compact in that respect. 1 Link to post Share on other sites More sharing options...
-missy- Posted February 7, 2021 Share Posted February 7, 2021 I have a different arrangement of collet chuck. So easy to use and invaluable when high accuracy is needed. Missy 2 Link to post Share on other sites More sharing options...
AndyID Posted February 8, 2021 Share Posted February 8, 2021 On 07/02/2021 at 00:43, -missy- said: I have a different arrangement of collet chuck. So easy to use and invaluable when high accuracy is needed. Missy I'll see your chuck and raise you an adapter. 3 Link to post Share on other sites More sharing options...
Guest Isambarduk Posted February 9, 2021 Share Posted February 9, 2021 (edited) On 07/02/2021 at 08:43, -missy- said: I have a different arrangement of collet chuck. So easy to use and invaluable when high accuracy is needed. Missy I have exactly the same arrangement but, sadly, the collet holder is no longer available. It is (well, it was) really useful as the holder screws directly onto the nose of the Unimat 3 spindle, so there is very little overhang (unlike some other arrangements involving a backplate). Edited February 9, 2021 by Isambarduk additional information Link to post Share on other sites More sharing options...
RMweb Premium 2mm Dabbler Posted February 10, 2021 RMweb Premium Share Posted February 10, 2021 (edited) 7 hours ago, Isambarduk said: I have exactly the same arrangement but, sadly, the collet holder is no longer available. It is (well, it was) really useful as the holder screws directly onto the nose of the Unimat 3 spindle, so there is very little overhang (unlike some other arrangements involving a backplate). That particular collett holder is still listed by Emco Holz und Hobby in Austria though importation might now be a little difficult - tinyurl.com/10urobov - current price €57.60 Pro Machine Tools Ltd in the UK, whom I would otherwise check, appear to currently have their website under maintenance. Regards Michael Edited February 10, 2021 by 2mm Dabbler spelling 1 1 Link to post Share on other sites More sharing options...
halfwit Posted February 16, 2021 Share Posted February 16, 2021 An EMCO ER/ESX25 collet holder can be had for the Unimat 3/4/any other variant with an M14x1 spindle thread. These come up on Ebay from time to time and are worth the investment, I use mine in preference to my ER16 holder, which in turn is usually used in the tailstock as a more accurate means of holding small drills. One recent job saw the ER25 holder being used in a dividing head for work holding and the ER16 in the milling spindle. Another item to look for if you own a U3 is a watchmakers collet adaptor. The business end is hardened and ground and fits in the end of the spindle, with a drawbar which fits inside the spindle and clamps the (threaded) 8mm watchmakers collets. One of the advantages of this accessory is the availability of stepped collets, very useful for holding small wheels and gears for facing/boring etc. 1 1 1 Link to post Share on other sites More sharing options...
RMweb Gold RedgateModels Posted February 22, 2021 RMweb Gold Share Posted February 22, 2021 So thinking of a collet chuck. Lathe has an MT2 taper, so I assume once I remove the chuck from the spindle adaptor and then remove the adaptor an ER20 with an MT2 taper will knock right in? ER20 or 25 - pros and cons apart from cost? Link to post Share on other sites More sharing options...
sagaguy Posted February 22, 2021 Share Posted February 22, 2021 5 minutes ago, RedgateModels said: So thinking of a collet chuck. Lathe has an MT2 taper, so I assume once I remove the chuck from the spindle adaptor and then remove the adaptor an ER20 with an MT2 taper will knock right in? ER20 or 25 - pros and cons apart from cost? ER25 collet chuck from RDG tools on my S7.Ideal collet size as i use them on my Warco milling m/c. Ray. Link to post Share on other sites More sharing options...
RMweb Gold RedgateModels Posted February 22, 2021 RMweb Gold Share Posted February 22, 2021 9 minutes ago, sagaguy said: ER25 collet chuck from RDG tools on my S7.Ideal collet size as i use them on my Warco milling m/c. Ray. Exactly the one I'm following on eBay Link to post Share on other sites More sharing options...
sagaguy Posted February 22, 2021 Share Posted February 22, 2021 Probably cheaper direct from RDG. Ray. Link to post Share on other sites More sharing options...
RMweb Gold RedgateModels Posted February 22, 2021 RMweb Gold Share Posted February 22, 2021 1 hour ago, sagaguy said: Probably cheaper direct from RDG. Ray. strangely not in this case Link to post Share on other sites More sharing options...
decauville1126 Posted February 22, 2021 Share Posted February 22, 2021 On 16/02/2021 at 15:52, halfwit said: Another item to look for if you own a U3 is a watchmakers collet adaptor. The business end is hardened and ground and fits in the end of the spindle, with a drawbar which fits inside the spindle and clamps the (threaded) 8mm watchmakers collets. One of the advantages of this accessory is the availability of stepped collets, very useful for holding small wheels and gears for facing/boring etc. I bought mine from Shesto back in the day when they did that sort of stuff, and have since bought vast quantities of WW 8mm collets, including step chucks, plus a number of blanks that I've drilled and slit for custom work. My Unimat3 is on it's second motor but I do have a conversion 24V kit (motor + pwm + ps) ready to go when the time comes. I also managed to bulk buy the three O-ring sizes required - loads cheaper than from the established sellers. I've also got an ES16 holder and collets too so that I can use the drawbar down the nose and the other on the tailstock at the same time. Link to post Share on other sites More sharing options...
RMweb Premium Vecchio Posted February 22, 2021 RMweb Premium Share Posted February 22, 2021 7 hours ago, RedgateModels said: So thinking of a collet chuck. Lathe has an MT2 taper, so I assume once I remove the chuck from the spindle adaptor and then remove the adaptor an ER20 with an MT2 taper will knock right in? ER20 or 25 - pros and cons apart from cost? It will, but in some cases the distance between MT2 cone and collet chuck is too short. I had to take off 2mm from the collect chuck to make it work. Also consider a draw bar to be sure the MK2 spindle doesn't get lose.See below draw bar and spindle adaptor. I use SX25 collets as they are the same as for my vertical unit. Lathe = Emco compact 5 Link to post Share on other sites More sharing options...
RMweb Gold RedgateModels Posted February 23, 2021 RMweb Gold Share Posted February 23, 2021 11 hours ago, Vecchio said: It will, but in some cases the distance between MT2 cone and collet chuck is too short. I had to take off 2mm from the collect chuck to make it work. So the MT2 cone would not bind in the spindle? My lathe is a bit smaller than yours which looks more like the CL250M's bigger brother, the CL300M Link to post Share on other sites More sharing options...
halfwit Posted February 23, 2021 Share Posted February 23, 2021 20 hours ago, decauville1126 said: I bought mine from Shesto back in the day when they did that sort of stuff, and have since bought vast quantities of WW 8mm collets, including step chucks, plus a number of blanks that I've drilled and slit for custom work. My Unimat3 is on it's second motor but I do have a conversion 24V kit (motor + pwm + ps) ready to go when the time comes. I also managed to bulk buy the three O-ring sizes required - loads cheaper than from the established sellers. I've also got an ES16 holder and collets too so that I can use the drawbar down the nose and the other on the tailstock at the same time. My watchmakers adapter was a lucky eBay find - lucky because the seller didn't know what it was and I only spotted it by chance. I only got the collet adapter itself, I had to buy a generic drawbar and shorten it. One of the things that I like about it is it only takes a fraction of a turn to tighten, unlike my ER holders, which makes facing axles to length quicker and easier (very useful when you've got 100+ to do!). I have a spare motor, bought when the original went 'pop' and let out some smoke. Took it into work, the cap. haas blown but as the motor runs ok he said its fine to use. 3 Link to post Share on other sites More sharing options...
RMweb Premium Vecchio Posted February 23, 2021 RMweb Premium Share Posted February 23, 2021 12 hours ago, RedgateModels said: So the MT2 cone would not bind in the spindle? Exactly. To overcome this I took off 2mm of the collett holder, there was no problem with mechanical strength as there is still enough material left. It may be different on your lathe, a collet holder spindle is available on the internet for less than 10£ - so probably woth a try. The only problem was that the flattened area used for the spanner gets less wide. Not a problem as I applied a few 6mm holes to take a hardened 6mm bar as a "spanner". Link to post Share on other sites More sharing options...
RMweb Gold RedgateModels Posted February 23, 2021 RMweb Gold Share Posted February 23, 2021 Think I'm going to get this: https://www.arceurotrade.co.uk/Catalogue/Machines-Accessories/Lathes/Model-C1-Lathe/C1-Lathe-Headstock-Accessories/ER-Collet-Chucks-for-SIEG-C1-Lathe It's made for my lathe so should fit and work best. Link to post Share on other sites More sharing options...
RMweb Premium Vecchio Posted February 23, 2021 RMweb Premium Share Posted February 23, 2021 1 hour ago, RedgateModels said: Think I'm going to get this: https://www.arceurotrade.co.uk/Catalogue/Machines-Accessories/Lathes/Model-C1-Lathe/C1-Lathe-Headstock-Accessories/ER-Collet-Chucks-for-SIEG-C1-Lathe It's made for my lathe so should fit and work best. I am sure it will. My problem was that my lathe is almost 40 years old and accessories are rare... (company left the market years ago) Link to post Share on other sites More sharing options...
RMweb Premium Izzy Posted February 23, 2021 RMweb Premium Share Posted February 23, 2021 I got one of the smaller ER16 ones for my CO ‘baby’ lathe ( for which I also had to get and machine a M14 backplate). They are well made and accurate and worth the money. A bonus if no other machining is needed. 1 Link to post Share on other sites More sharing options...
AndyID Posted February 24, 2021 Share Posted February 24, 2021 My ancient South Bend 9" has a MT3 headstock so I broke-down and sent for a MT3 to ER-16 collet holder. It will project a bit more than my home-made affair but the additional clearance could be useful in some situations. For $24 (including shipping) how bad could it be? Link to post Share on other sites More sharing options...
RMweb Gold RedgateModels Posted March 1, 2021 RMweb Gold Share Posted March 1, 2021 (edited) Fits like a glove 🙂 Edited July 11, 2022 by RedgateModels 6 1 Link to post Share on other sites More sharing options...
RMweb Gold RedgateModels Posted March 8, 2021 RMweb Gold Share Posted March 8, 2021 (edited) And now have a set of collets Just need to re cut the taper on my wheel holding fixture as now I have it in a collet it's clear it has far too much runout Edited July 11, 2022 by RedgateModels 4 Link to post Share on other sites More sharing options...
AndyID Posted March 8, 2021 Share Posted March 8, 2021 (edited) $24 well spent I think. This the collet holder that plugs into the Morse Taper on my lathe. It does have a lot more overhang than my home-made effort but there is very little runout. Looks like one third of a thou and that could be the collet more than the holder. Pay no attention to the piece of stainless steel behind the holder. It's just a cover that screws on to the lathe's nose to protect the threads. EDIT: I have a TOYO miniature late and it has a #1 Morse Taper headstock. I was wondering if there are ER16 collect holders similar to this but with the smaller taper. There are, and there are also #2 MT versions. Edited March 9, 2021 by AndyID More info 2 Link to post Share on other sites More sharing options...
RMweb Gold RedgateModels Posted March 18, 2021 RMweb Gold Share Posted March 18, 2021 (edited) So what's going on here? Really pleased how well the diamond cut-off wheel worked. £7 well spent. I'm making an expanding mandrel for the spindle so I can turn the lathe manually. A large 125mm handwheel will be fitted to it in due course Yes, that is a Rawl bolt inside, why re-invent the wheel 😉 Edited July 11, 2022 by RedgateModels 6 1 Link to post Share on other sites More sharing options...
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