Holding milling cutters in a drill chuck

[AjohnwParticipant @ajohnw51620]

Did you measure it by holding say some silver steel in it and rotating that in a checked V block and measuring the run out at the end of the taper ?

The V block can be checked with the same bar assuming that the surface is flat and that can be checked by reversing it.

John

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[AjohnwParticipant @ajohnw51620]

Posted by Roy M on 07/10/2016 13:26:28:

see WNT Tooling catalogue on line

Interesting site. Weldon run out 3um. Best ER collets and best chuck 3um if you buy 2um collets.

I can't find the item in the photo – where is ut ?

John

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[Martin KyteParticipant @martinkyte99762]

No, just stuck the 2morse in the lathe mandrel and an used a DTI on a milling cutter shank held in the jaws.

Martin

[Roy MParticipant @roym]

John, from WNT home page, go to tool holders—rotating tools—- micro precision collets. Hope this helps. I used to deal with them until about 4 months ago. If you can get onto their site proper, there is masses of info on everything you need to know about machining, hope this helps. Roy.

Just a thought, for all those interested, the flat on the cutter shank is positioned so that it is not directly opposite a cutting flute. This effectively reduces the cutter run out.

Edited By Roy M on 07/10/2016 18:07:43

[JasonBModerator @jasonb]

Posted by Roy M on 07/10/2016 17:48:53:

Just a thought, for all those interested, the flat on the cutter shank is positioned so that it is not directly opposite a cutting flute. This effectively reduces the cutter run out.

Edited By Roy M on 07/10/2016 18:07:43

How would that work if you are using the side of teh cutter where the flute follows a helix around the tool?

[Roy MParticipant @roym]

JasonB, I'm not sure that the flutes always go around the tool, especially on a two flute slot drill. If you would like to try clamping the cutter in a different position I'm confident you will see a difference. If you are working to less than .003 mm on a home mill, I guess it would be quite important. I suppose it just follows the same logic as positioning the drill correctly in the lathe tail stock chuck. Roy M.

[EmgeeParticipant @emgee]

Hi Roy M

Please advise on fitting a drill correctly in the tailstock chuck.

Emgee

[Roy MParticipant @roym]

Emgee, the cutting edges of the drill should be set vertically, so that any mis-alignment in the 'y' direction(which is adjustable) is minimised, this in turn assists the drill to cut size and true. Roy M

[HopperParticipant @hopper]

Posted by Ian S C on 07/10/2016 10:48:12:

Hopper, when I first started with my mill, using a Jacobs chuck, the chuck was held to the MT3 arbor by a JT 6 taper, it was the MT 3 taper that let go. The JT taper is designed to be semi permanent, unlike the MT taper that is designed to be removed from it;s socket.

Ian S C

Silly me, I had assumed anyone milling with a drill chuck would have a draw bolt in place to hold the Morse taper end in place.

[EmgeeParticipant @emgee]

Thanks for the tip Roy M will keep it in mind, you mention Y axis in your reply but on my lathe the axis are referred to as X and Z, the latter being traverse from tailstock to chuck so I believe your Y is my X ?

Emgee

[Ian S CParticipant @iansc]

Hopper, it was before the days of forums like this one, I had the machine with only a Jacobs chuck, I had a 1/4" end mill, so you just get milling, no one to tell me not too, but I soon learned. At that time I had never heard of a draw bar.

Ian S C

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