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Thread: Collet Chuck for the Lathe
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10th January 2015, 09:45 AM #1
Collet Chuck for the Lathe
This week at work I was doing a job that mostly required me to simply "Be There" and watch for problems. This gave me lots of time to fill in with various means. I was doing some chicken scratching regarding the means to finish the 3 ball handle that was generously given to me by someone who has recently been in the spotlight for similar actions.
I was thinking about how to align the handle in the lathe in order to set the taper for the block to hold it in the mill for drill and tapping. An ER collet chuck would be handy crossed my mind. This is an issue that I have discussed before and I have given it a lot of thought over quite a long time. The problem is that a D 1-6 backing plate is hard to find and expensive. The only price I have seen was over $US1000. The other way was to make one with a taper to fit the spindle. An MT6 taper however is not something to be undertaken lightly, but was the method I had decided to eventually use.
Scottyd's collet chuck was in the back of my mind. The advantages of a small lathe.
I had a sudden thought. I have no idea what prompted it. My lathe came with virtually all the usual attachments, including a drive plate. What if I turned the drive plate into a collet chuck. If I need to use it as a drive plate I still can. I don't currently have any MT6 centres or adaptors anyway. Make a dead centre that fits into my biggest collet. I have the steel to make this. I would use a thick plate as the mounting base and press and weld the round stock into it. The problem with MT6 is that it takes some big expensive pieces of steel to make anything.
I would appreciate any comments or suggestions regarding this. I may have forgotten something important in my excitement. The drive plate only has 3 cam locks, but I would think this would be more than enough for what a collet would be used for.
I only have an ER32 collet set at the moment, but considering the cost for an ER40 set from CTC, I may order one of those first. Makes sense to me.
Dean
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10th January 2015 09:45 AM # ADSGoogle Adsense Advertisement
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10th January 2015, 10:08 AM #2
Hi Dean,
The drive plate may be CI so welding may not be that simple.
If you think you will need larger sizes and not smaller i would look at an ER50 set from Taiwan Tools. They go from 10mm-34mm, and you only need 12 collets as they cover 2mm each. the downside is they are $15 each. http://www.taiwantool.com.tw/product...a02c=210560005
Cheers,
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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10th January 2015, 10:37 AM #3
I was not going to weld the drive plate. I will still keep it intact so it may be returned to its normal state. All I will need to do is drill and tap it.
I would use a thick plate as the mounting base and press and weld the round stock into it.
Thanks for the reminder about ER50 having a 2mm grip range. This does make them more viable, but still quite a bit more expensive. If I bought ER40 collets from CTC, I would also get an MT4 chuck so they could be used in my mill. I am not sure how much use an ER40 set would be in the mill, but I am aware that the ER50 set would be very useful in the lathe. I see that the price you quoted is in $US. What is the freight cost like at Taiwan Tools? Damn computer. It keeps dropping letters when I hold down the shift key. I have seen the results of this in my posts a number of times in the past. Cannot blame it for all the other faults tho.
Can someone tell me the OD of an ER40 chuck please? Oh, and ER50 chuck as well. I have some sort of spindle in my steel stock that is being saved for a special job. This may be it. The only piece of 65mm stock I have available. I measured it for an MT6/ER collet chuck but not quite big enough. The 65mm diam is not very long, and from memory knurled.
Dean
Dean
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10th January 2015, 10:40 AM #4
Ok, i understand now.
ER40 nut is an M50x1.5 thread, i can't remember the size of the ER50.1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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10th January 2015, 11:14 AM #5SENIOR MEMBER
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Mick Moyles in Sydney sells D1-6 backplates. IIRC approx $130 each. Not too bad considering.
You can also buy a MT5 ER40 collet chuck for cheap. Buy a 6-5 reducer and done.
http://www.ebay.com.au/itm/281338172...84.m1423.l2649
Of course now you're at risk of tolerance stacking giving you more runout.
Making one is a good way to go IMO. I'd go at least ER40 as ER32 doesn't go big enough.
I have a Pratt-Bernard EC series collet chuck and it's almost a permanent fixture on the Chipmaster, I use it all the time. I keep thinking of fitting one to the Monarch CY but I'd only gain the ability to handle round bar from 35mm to 40mm over what I already have so I haven't bothered. I have a spare L-00 spindle nose collet chuck awaiting butchery if ever I have the need....
PDW
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10th January 2015, 12:01 PM #6GOLD MEMBER
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Hi Dean, if you look in the"your latest project", you will see that I made one for my ER25 collets, the same way. Post 1371 is what you'll be looking for.
I marked a point on mine so that it always went back on at the same location. Seeing you already have ER32 collets, why not make one to suit the 32s, then later if and when you need them you could make one for the 40 or 50 as required. At least, it will give you something to do at work.
Kryn
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10th January 2015, 01:53 PM #7Senior Member
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10th January 2015, 02:34 PM #8GOLD MEMBER
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One thing against the chuck PDW linked to is if you are doing long work you may be* limited in dia that can pass through the draw bar. This may not worry you of course.
I have three ER32 chucks for my lathe. MT5 draw bar like "thing" with a 19mmish though hole, a flange mount mounted on a camloc backing plate and shaft mount for eccentrics as Bobs above.
Stuart
* I dont know the thread size on the draw bar
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10th January 2015, 04:06 PM #9SENIOR MEMBER
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10th January 2015, 04:31 PM #10Mick Moyles in Sydney sells D1-6 backplates. IIRC approx $130 each. Not too bad considering.
It is worth considering, tho as I already have one there may not be any point.
You can also buy a MT5 ER40 collet chuck for cheap. Buy a 6-5 reducer and done.
http://www.ebay.com.au/itm/281338172...84.m1423.l2649
Of course now you're at risk of tolerance stacking giving you more runout.
Making one is a good way to go IMO. I'd go at least ER40 as ER32 doesn't go big enough.
Hi Dean, if you look in the"your latest project", you will see that I made one for my ER25 collets, the same way. I marked a point on mine so that it always went back on at the same location. Seeing you already have ER32 collets, why not make one to suit the 32s, then later if and when you need them you could make one for the 40 or 50 as required. At least, it will give you something to do at work.
Kryn
I only have one D 1-6 back/drive plate and my plan was to make this a semi permanant job.
Unfortunately all I can do at work is cerebral metalwork and there is a limit to how many chicken scratch plans one can draw up.
Dean
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10th January 2015, 10:34 PM #11GOLD MEMBER
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10th January 2015, 11:20 PM #12
I think it would be quicker and easier to just mount a camlock chuck. I don't have a lot of practice with 4 jaw work. Most of the recent work has been for eccentrics. I am not sure tho, how much work I would have for such a chuck. I could always make an MT4 taper with parallel OD to fit the ER32 chuck in if I had enough need.
My plan for an MT6 mounted collet chuck was to use a tube drawbar. Mt6 and 52mm spindle gives a decent diameter to play with.
Dean 1371 is the thread you'll be looking for, it was made to go on a little 7 X 12 lathe and goes all the way through,
Kryn
I also had a look at Mick Moyles site. You must get a good discount PDW. The price I found was a bit more than $130.
Dean
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12th January 2015, 02:54 AM #13
Hi Guys,
Treat this link with caution ! It tried to install something on my machine.
http://www.taiwantool.com.tw/product...a02c=210560005Best Regards:
BaronJ.
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12th January 2015, 06:13 PM #14
Another question that has come to mind. Setting the taper for the collet chuck.
The idea I came up with is to carefully turn a shaft in the lathe to the diameter of the max size of the largest collet. Slide the collet on as it would be facing when in the chuck. Indicate and adjust taper to suit. The collet should be a firm fit on the shaft. I hope my TTA will adjust to 8 deg.
Does anybody have any other ideas?
Dean
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12th January 2015, 07:04 PM #15Senior Member
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Just bought a 20mm collet and mounted a 20mm shaft in my lathe. The collet was relatively snug, certainly wasnt wobbling about or at the point where the dial indicator was going to push it around. I dialed off that, did the last cut and then blued up the inside of the taper. I pushed the collet in with the 20mm shaft still in it and it came out with a pretty even spread of blue throughout the taper, so I called it done. I didnt bother with the 30° taper, its so short that I just set the compound slide off the guage on the lathe and got on with it. Blueing looks to be fine on it too, but I assume youll be buying the nut.
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