Unimat 3 collet holder

[Former MemberParticipant @formermember12892]

[This posting has been removed]

[Turbine GuyParticipant @turbineguy]

Thanks Bill, John, and Hollowpoint. I put in a request at Ebay to return the collet set. When I hear from the seller, I will let you know what he has agreed to. Ebay has a resolution policy that they will help if the seller and buyer can't come to an agreement.

Edited By Turbine Guy on 17/02/2021 19:40:25

[Former MemberParticipant @formermember12892]

[This posting has been removed]

[Turbine GuyParticipant @turbineguy]

Thanks to all of you that got me to request a refund. Ebay has a well thought out refund procedure that protects the buyer and seller. I followed their guidelines exactly as they instructed. The seller did everything he could to avoid giving me a refund but Ebay's rules forced him to give me a full refund. When he refused to send a return shipment label required by their rules, Ebay did not require me to send back the collet set. I lost a lot of time waiting for the collet set and getting the return, but thanks to all of you, it has not cost me any money.

Thanks again to all of you,

Byron

[Former MemberParticipant @formermember12892]

[This posting has been removed]

[Turbine GuyParticipant @turbineguy]

br thought his collet set was not the best for me based on our communications, so I searched for another collet set. This time I looked for something sold in the USA since the overseas shipping takes so long. I found on Ebay the collet set shown below. When I asked the seller if the parts were made by EMCO, he sent me the following response:
Hi, The chucks are original Emco, the collets are not the ones Emco sourced from Schublin but are new. The tommy bars I made, the original ones from Emco were a little smaller than needed. The boxes are new taken from another product. The box inserts I also made. If the collets were the Schublin they would alone sell for at least 450.00. Emco never sold a set like this, I put this together to make a nice usable set all in one box. Schublin never made a 3/4 collet. I made several of these and these are the last two ( one mill – one lathe ) that I will ever have to sell.
When he mentioned the collets were ER, I did some research on collets and found from this Collet Link the ER collets are suitable for the Unimat 3 if the chuck is an ESX version. The chuck is for a EMCO Compact 5 milling attachment that is an ESX version with the same mounting threads as a Unimat 3. I purchased this set and was given an estimated delivery date of Friday, February 26 but bad weather is delaying the shipment a little. I hope I got it right this time. Thanks all of you for your help.

[EmgeeParticipant @emgee]

The listing title doesn't make sense to me, M14x1 for the milling spindle is correct but the tailstock on an Emco 5 is MT1 and the barrel is plain, not threaded.

I hope I'm wrong but I think you may be sending another lot back.

Emgee

[Turbine GuyParticipant @turbineguy]

Hi Emgee,

The seller had two collet sets. One was for the Compact 5 head stock and one was for the milling spindle. The one I purchased was the one for the milling spindle. With the M14x1 threads it will fit my headstock, tailstock, and milling attachment. Some of the pictures I found of the Compact 5 collet chuck for the milling spindle looked different than what was shown in the collet set. I found this Compact 5 Link that showed an accessory collet holder that looks like the one I purchased, so apparently the collet holder changed over the years.

Thanks for the feedback,

Byron

[Turbine GuyParticipant @turbineguy]

This You Tube Video selling a EMCO Compact 5 and accessories shows the version of the EMCO 200 050 collet attachment that I believe I am purchasing. You can see from the video much clearer than from the Compact 5 Link I showed in the last post, how much different this version of the collet chuck looks than what was previously shown in this thread.

[EmgeeParticipant @emgee]

The earlier picture I posted was of a later version of the same chuck, only difference being the radiused collet closer, thread at the back for the spindle is same, M14x1

Emgee

[Turbine GuyParticipant @turbineguy]

I received the collet set and it looks very nice. I don't have any dial calipers so I checked the runout as described below that was copied from an Email sent to a friend. The picture below was sent in the Email.

'The collet set actually got here on Friday even going thru the bad weather. The attached picture shows the setup I used to check the runout. I checked the runout by turning down a rod held in my 3 jaw chuck until it's surface was concentric with the lathe centerline. I then attached the new collet chuck to the machined portion of the rod. Next I mounted a face plate to the tail stock and moved the faceplate until it made first light contact with the collet chucks mounting face. The collet chucks mounting face protrudes about 0.4mm from the end of the chucks body. When I found the largest feeler gage that could be inserted in that gap, a feeler gage 0.025mm larger would not go in the gap at any rotation of the 3 jaw chuck. Also the force needed to slide the feeler gage seemed the same at any rotation of the 3 jaw chuck. I also shined a light on the opposite side of the tailstock at the contact edge of the collet chuck mounting face that was in light contact with the faceplate of the tailstock. No light was visible in any rotation of the 3 jaw chuck. I think the collet chuck and collets will be fine for my needs. The larger tommy bars he included in the set were welcomed by my arthritic hands. I am very pleased with this collet set'.

Thanks again for all your help,

Byron

[EmgeeParticipant @emgee]

Novel way of checking for runout but I guess but all it shows is the collet bore is at right angles to the back face of the chuck. The real test is when you screw it on the lathe spindle and fit a test bar against a dial gauge, or even notice excess run-out by eye.

Thanks for posting the results and I hope it all goes well for you.

Emgee

[Turbine GuyParticipant @turbineguy]

Hi Emgee,

I'm not sure if the way I tried to test the run-out by eye is the way you intended. I put my longest reamer in the collet chuck so that it extended out as far as possible. I then turned on the lathe at a speed of about 400 rpm and watched the movement of the end. With one of the collets from the set I received, the run-out of the end was just verily noticeable. With a very precision collet I purchased for a critical machining job, the runout at the end was not visible. The picture below was taken with the precision collet and the lathe running. The center in the tail stock was not contacting the reamer end. I moved it close to have a stationary reference point.

Thanks for your input,

Byron

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