Needs Pictures: 0
Picture(s) thanks: 0
Results 16 to 30 of 36
Thread: Collet Chuck for the Lathe
-
12th January 2015, 07:17 PM #16
-
12th January 2015 07:17 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Age
- 2010
- Posts
- Many
-
12th January 2015, 08:28 PM #17Senior Member
- Join Date
- Jul 2012
- Location
- Griffith NSW
- Posts
- 257
-
12th January 2015, 08:48 PM #18Philomath in training
- Join Date
- Oct 2011
- Location
- Adelaide
- Age
- 59
- Posts
- 3,149
Confession time -
Once many collet chucks ago I made a chuck with 7.5 degrees. It worked (in a fashion) because I think the 30 degree taper grabbed at the front and compressed things enough. It was taken to 8 degrees a short time later when I realised the error, but to me it suggests that the ER 8 degrees is not as critical as say setting up a Morse taper. I've used the compound for all of my ER chucks so far (with a bit of a polish). The TTA will give a smoother finish but over the length of a collet while being spot on is the target I don't think that a slight error (a few tenths) will necessarily end civilisation. (Remembering too that the grade of collets that most of us buy are not likely to be spot on co-axial/ concentric either, so the "master" could be out as well) Provided the error is not great, the bore can always be bored again with the "correct" angle too.
Michael
-
12th January 2015, 09:00 PM #19
Sounds fair enough Michael. I was going to check the TTA tonight, but I forgot.
I need to remember to make the chuck somewhat longer than needed to allow for further machining. Making the thread extra long may be a good idea as well.
Dean
-
12th January 2015, 09:43 PM #20GOLD MEMBER
- Join Date
- May 2011
- Location
- Murray Bridge SA
- Posts
- 3,339
I set my collet on a shaft that was drilled and tapped on the end, inserted in the 3 jaw, and the bolt tightened up to hold it square, then clocked it. This afternoon, I ground it internally to give it a polished finish, the Dremel flexible shaft makes an excellent internal grinder.
Can load pictures if required.
Kryn
-
12th January 2015, 10:10 PM #21
Ok I'm a wuss. I have very little time to spare and my silly season is about to start. Vintage. All work, no play and 72hr weeks. I also don't have any threading tooling. I can knock something up for external threads if I have to. I am waiting on the discount from Dale tools so I can buy some more tooling. He did offer to let me try some threading tools.
Dean
-
12th January 2015, 10:18 PM #22
Did the shaft have a shoulder to tighten the collet against? I am interested in pictures.
I was thinking about grinding the taper finish with the pencil air die grinder that I bought when Rob (Nearnexus) was talking about them about 18 months ago.
I also have a Dremel and flex shaft, but the die grinder is cylindrical and narrow. A mount for the lathe is very simple to make.
Dean
-
12th January 2015, 11:13 PM #23GOLD MEMBER
- Join Date
- May 2011
- Location
- Murray Bridge SA
- Posts
- 3,339
No shoulder on the shaft, just up against the chuck with a washer and bolt at the back. I like the KIS principle
I found that the air die grinders are noisy and the exhaust causing moisture on the lathe bed. I used the Dremel and flexible as that is what I had, that was small enough to get inside the chuck, about 60 mm, keeping the stone as close as possible to the head. The holder was a piece of 12 mm ID pipe X 40 mm long drilled to 13 mm, welded to 25 X 8 flat with a small screw holding the housing in place.
Pics tomorrow.
Kryn
-
13th January 2015, 09:05 PM #24
I checked the TTA on my lathe finally. The scale says +/- 10 degrees so it should work fine.
Dean
-
14th January 2015, 11:50 PM #25GOLD MEMBER
- Join Date
- May 2011
- Location
- Murray Bridge SA
- Posts
- 3,339
Updates on making my ER 25 collet chuck
Setting the collet
Depth.jpg
Locked in 2.jpg
Set up to clock.jpg
Clocking.jpg
Start Grinding.jpg
Internal Grinder Holder.jpg
Ground.jpg
Hope these help,
KrynLast edited by KBs PensNmore; 14th January 2015 at 11:53 PM. Reason: Another picture
-
15th January 2015, 08:50 AM #26
Thanks Kryn. What type size of collet is that?
The flexible shaft I have for my Dremel has a moulded handle so it won't fit in a holder neatly like yours which is why I intend to use the die grinder. The only issue with that is that I need a good supply of air. I will have to use the extra air tank (45kg lpg cylinder). My air compressor tank has sprung a leak. It is rusty. It still works at the moment, but loses air. I will have to do something about it before using the die grinder as I don't want to run out of air half way thru a pass. It is only one of the cheap 2.5hp direct drive units. Maybe I should buy another cheapie and connect this compressor to that tank as well.
Dean
-
15th January 2015, 09:47 AM #27SENIOR MEMBER
- Join Date
- Jun 2012
- Location
- SA
- Posts
- 1,478
I used my pencil air die grinder to make a collet chuck for the Schaublin.
https://www.youtube.com/watch?v=HXGcLwWZeSQ
No problem.
If anyone is getting moisture from the grinder air exhaust it means their water trap/filter is not working.
RobThe worst that can happen is you will fail.
But at least you tried.
-
15th January 2015, 11:04 AM #28
Made the whole collet chuck?
I have just watched that video. I was hoping to see some construction happening.
I am now thinking about a grinding wheel to use for grinding the taper finish. CTC has some 30mm diam wheels that have internal threaded centres which screw onto the collet thread on the die grinder.
Delivered With Mounting Nut Threaded For Micro Grinder Spindle Nose
These seem perfect to me. Does anyone have any other ideas. Having these mounted direct to the grinder is better than on the end of a 3mm shaft and the wheel is larger in diameter than the die grinder so the front of the grinder can enter the collet chuck. The only question is whether a 30mm wheel will fit inside an ER40 chuck.
I have almost decided to go with the ER40 from CTC, as I can get an MT4 chuck and 2 extra nuts on top of the full collet set for less than the cost of 12 ER50 collets from Taiwan Tools. My only concern is freight. I got as far as the checkout at Taiwan Tools, trying to find the freight cost, but the next step was confirming the purchase. Did I miss something with regards to freight or do you have to email for a quote. On the other hand I am still waiting on a reply from CTC regarding surface freight cost. It is a bit hard to make a decision without all the facts.
Dean
-
15th January 2015, 11:55 AM #29SENIOR MEMBER
- Join Date
- Jun 2012
- Location
- SA
- Posts
- 1,478
-
15th January 2015, 12:36 PM #30GOLD MEMBER
- Join Date
- May 2011
- Location
- Murray Bridge SA
- Posts
- 3,339
Hi Dean,
I have a spare shaft if you want, for what it cost me, $15.00 plus postage. The collets I use are ER25 metric, as that is what came with the mill when it was given to me.
In regard to the air compressor, I had a couple of those and hooked them together for spraying, only just kept up. If you go to the local tip you might find a couple or more . Early last year I gave a tank from one away, as well as a NEW top assy. that was given to me the year before. I gave a friend my old one, that made 7 that he had to repair, a lot of them it's the head gasket (if you could call it that) that lets go, or the valves.
I went to trash converters to look for a larger unit, they wanted $450 for a S/H unit, went to the local Auto pro and got a brand new one with warranty and delivered for $399 (same unit) .
Kryn
Similar Threads
-
ER32 Collet Chuck for 2 1/4 x 8 TPI Lathe Spindle
By iron bark in forum METALWORK FORUMReplies: 4Last Post: 21st January 2014, 11:15 PM -
Fitting collet chuck to lathe for Dummies
By Grahame Collins in forum METALWORK FORUMReplies: 18Last Post: 16th April 2012, 11:43 AM -
ER40 Collet Chuck for a lathe.
By aametalmaster in forum METALWORK FORUMReplies: 2Last Post: 6th June 2011, 08:29 PM -
Lathe collet chuck.
By .RC. in forum METALWORK FORUMReplies: 8Last Post: 25th February 2010, 11:43 AM