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Wouldn't it be nice

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Vic02/04/2016 15:26:53
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If you could buy ER32 collets in tapping drill sizes like 3.3 and 4.2! It would save closing 4 and 5 mm collets down so much. wink

Vic02/04/2016 15:30:27
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Then maybe I should just try and turn the shank down on some drill bits? cheeky

MW02/04/2016 15:36:12
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I do understand the scenario, Vic; standing there with a spanner in each hand and using a couple of your remaining fingers to hold the drill in place whilst you tighten it up, you may be onto a niche! If you have the chuck out of the machine with foresight you could sort it out in a bench vice so it frees up one hand and alot more room about you. Thats what i do sometimes, but then again it's not always out of the machine, is it? 

Michael W

Edited By Michael Walters on 02/04/2016 15:38:29

Nick_G02/04/2016 16:03:07
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.

But then they would no longer be 'ER' collets. laugh

The ER stands for 'Extended range' (I am told) What you desire already exists in the form of the 5C system.

Nick

ega02/04/2016 16:03:20
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Would the imperial sizes help?

JasonB02/04/2016 16:10:33
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Imperials come just below/above those two sizes at 1/8" and 3/16"sad

Nick I have not seen 5c colletholders that fit a milling spindle or tailstock not to mention the cost of a set of 0.1mm increment 5C colletssurprise

What would be handy are emergency ER collects that you could machine to suit commonly used sizes much like you can buy emergency 5C collets

 

Edited By JasonB on 02/04/2016 16:36:40

Nick_G02/04/2016 16:15:21
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.

But thinking about the thread title "Wouldn't it be nice"

It would be even nicer if character 'Beckett' from the TV series 'Castle' came round and got good-n-dirty in my grubby workshop. devilsmileywink

 

Nick angel

Edited By Nick_G on 02/04/2016 16:16:33

JasonB02/04/2016 16:30:02
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The other option is to knock up a few of these for your commonly use size bits then slip them into a larger ER collet, grind a flat on the side of te bit if you feel the need.

I made that one when I did not have room for teh ER chuck so had to use a MT3 collet but only had larger sizes.

Vic02/04/2016 16:50:41
2615 forum posts
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Actually Jason that's not a bad idea. In the meantime I've turned down the shank of a 4.2 mm drill bit and it's doing the job although I'm not convinced of the concentricity. It will do until Ketan gets some 4.2 and 3.3 ER collets made up ... surprise

JasonB02/04/2016 16:55:28
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He does do a 3.5 collet which I don't find too hard to close down on a 3.3drill , lot easier than using a 4mm

MW02/04/2016 17:18:43
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I'm pretty sure you could find a local engineers workshop to spark erode these collet to size. It'll probably cost around £15 for them to do it.

Michael W

Vic02/04/2016 17:25:40
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Posted by JasonB on 02/04/2016 16:55:28:

He does do a 3.5 collet which I don't find too hard to close down on a 3.3drill , lot easier than using a 4mm

That's worth knowing, thanks.

ega02/04/2016 18:12:47
1812 forum posts
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I don't think anyone mentioned the possibility of using a ball bearing nut to help in closing.

Ed Duffner02/04/2016 18:41:38
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Could a parallel shank pin-chuck be used and held in a bigger ER32 collet?

Ed.

Ajohnw02/04/2016 18:57:02
3631 forum posts
160 photos

laughUse er40 and stick a much lower number er collet holder in it. Might be ok in er32 as well but I would probably make the smaller one to go straight into the larger collet socket.

John

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Vic02/04/2016 20:36:27
2615 forum posts
20 photos
Posted by Ed Duffner on 02/04/2016 18:41:38:

Could a parallel shank pin-chuck be used and held in a bigger ER32 collet?

Ed.

Nice idea but I don't think my biggest pin chuck will take a 4.2. I like your thinking though!

Posted by ega on 02/04/2016 18:12:47:

I don't think anyone mentioned the possibility of using a ball bearing nut to help in closing.

I already use them on both the mill and lathe.

Ajohnw02/04/2016 20:54:10
3631 forum posts
160 photos

You could hold a cut down er16 extension collet holder in it - even trim the shank up to ensure it runs true with one size of collet in it. I didn't think I would use er16 much on mill but find I do as it gives a much better view of what is going on.

John

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MW02/04/2016 21:00:39
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Posted by Ajohnw on 02/04/2016 20:54:10:

You could hold a cut down er16 extension collet holder in it - even trim the shank up to ensure it runs true with one size of collet in it. I didn't think I would use er16 much on mill but find I do as it gives a much better view of what is going on.

John

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Yeah, ER40 for example, takes probably 2-3 in. of daylight away from you, so i use ER20 and sits right up close to the spindle.

Michael W

Peter Greene03/04/2016 01:35:54
15 forum posts

I just use a drill chuck on a 1/2" parallel shank in a 1/2" collet. The only time I use a drill in a collet is when I'm seriously restricted in height.

Edited By Peter Greene on 03/04/2016 01:36:18

Steve Withnell03/04/2016 10:03:52
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819 forum posts
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Wouldn't it be nice to have a set of stub drills in 0.1mm increments to 6mm...or to 10mm?

 

PS: At model engineering prices,  not aerospace tool room prices

Edited By Steve Withnell on 03/04/2016 10:04:43

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