I am about to do a heap of my ones as well . Things i have found previously were , if the wheel is not exactly on centre it will give a result that mimics a bow shaped collet . I always have a gauge pin in the collet so it holds true dimensions . Running the lathe at a lot higher speed , as with tool post grinding will generally give a better finish . Just some points that work for my set up running a jig grinding head in the tool post . Cheers .
Wow .002" runout with a collet is unimpressive. My 3 jaw Chinese chuck has .0015" runout. When I need a collet I've been making one from a piece of scrap round bar, and clamping it in the 3 jaw chuck. I have been thinking about buying some Chinese ER32 collets, but now I know I will need to pay for a good set of collets from a reputable company. Thanks for posting the video!
Great job on grinding collet holder at least now you know its running true to your lathe spindle. What a shame the collets are so badly manufactured in the first place. Tony
Great content as usual, love yr channel. I’ve been thinking about doing the same operation on my chinese collet chuck. Did you run a dial indicator on the finished grind to check runout ?
I have had poor results with my Chinese er32 + their Collets. Collet holder has little run out so my Collets are junk. Got a usa made er32 and with these Collets run out was still bad, they are not used much and use my Hardinge 5c and my rubber flex collets
Hello, late to the game, but how would you best go about grinding in the collects now that the holder is on center? I would imagine it being difficult to hold without distorting it?
Hi Billy. When the collets are made the last operation is to split the ends of the collet so it springs open you then rely on the collet holder and nut to push it back together. Try looking at the collet nut some are machined offset. If you look inside the nut sometimes you can see the offset. The nut bore is to one side, changing the nut may reduce the runout.
Hi the only way I can think of is holding the part between centres grind half and turn it around to grind the other end. You would need a larger grinding wheel and robust spindle to hold it without vibration.
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A lot of good methods for many projects. Very helpfull to know.
Thanks.
I am about to do a heap of my ones as well . Things i have found previously were , if the wheel is not exactly on centre it will give a result that mimics a bow shaped collet . I always have a gauge pin in the collet so it holds true dimensions . Running the lathe at a lot higher speed , as with tool post grinding will generally give a better finish . Just some points that work for my set up running a jig grinding head in the tool post . Cheers .
it look more like .020 run out to me not 2 thou but 20 thats no good for a collet chuck
Hi Barry On my DTI each div is 0.0001" one full revolution of the dial is 0.010"
Wow .002" runout with a collet is unimpressive. My 3 jaw Chinese chuck has .0015" runout. When I need a collet I've been making one from a piece of scrap round bar, and clamping it in the 3 jaw chuck. I have been thinking about buying some Chinese ER32 collets, but now I know I will need to pay for a good set of collets from a reputable company. Thanks for posting the video!
Great video, I like your power tool holder and dial indicator holder!
Thanks now I have to make one of those holders for myself thanks that was a awesome idea
Great job.
Thanks for sharing.
Great job on grinding collet holder at least now you know its running true to your lathe spindle.
What a shame the collets are so badly manufactured in the first place. Tony
I thought that was very interesting
Thank you.
Must make myself one of those small powertool holders. Think I have some ally plate here somewhere
Great content as usual, love yr channel. I’ve been thinking about doing the same operation on my chinese collet chuck. Did you run a dial indicator on the finished grind to check runout ?
Hi Michael. Yes I did and the run out was zero as you would expect.
enots engineering for fun why not try grinding one of the collets
Kudos!
Thanks for sharing
I have had poor results with my Chinese er32 + their Collets. Collet holder has little run out so my Collets are junk. Got a usa made er32 and with these Collets run out was still bad, they are not used much and use my Hardinge 5c and my rubber flex collets
Where is your #GTWRIndicatorHolder ? Everyone does it a bit different - great to see.
Hello, late to the game, but how would you best go about grinding in the collects now that the holder is on center? I would imagine it being difficult to hold without distorting it?
soft solder/superglue a ring to both ends. drill/ream through in chuck.
slip on mandrel. grin OD.
pop back in chuck, do ID.
remove rings.
Hello Allen, if, like me, you can only afford the Chinese collets how do I remove the 2 thou? is there a way to grind them?
Hi Billy. When the collets are made the last operation is to split the ends of the collet so it springs open you then rely on the collet holder and nut to push it back together. Try looking at the collet nut some are machined offset. If you look inside the nut sometimes you can see the offset. The nut bore is to one side, changing the nut may reduce the runout.
@@enotsengineering thankyou
Sir, a pin whose diameter is 40mm and length is 6 inches. How to grand on a lathe. Job on the lathe is ruff grand. Plzzz reply sir....
Hi the only way I can think of is holding the part between centres grind half and turn it around to grind the other end.
You would need a larger grinding wheel and robust spindle to hold it without vibration.
Creat a video...plzzz sir..