Er 40 chuck

[SG51Buss]

Not sure if you have this, so I'll attach it anyway. Looks like the ER-40 collet chuck uses an M50 x 1.5mm thread for the collet nut. That's very close to a 2" x 16 TPI. Your 2" stock is just the right size for the chuck, but you'll need something larger for the nut.

On my chuck, there's an enlarged ring for the tommybar holes. Assuming you have a 1.5" x 8 TPI spindle, leaving a 1/4" wall thickness to the 2" OD collet chuck, how do you plan to tighten it to your spindle?

 

[bosephus]

Sg51buss

The stock i am using for the chuck is 3 inch dia .
So it is plenty big to make the nut out of as well . I wont mess with the outside dia of the chuck until the very end .. then i will most likely match it to the outside dimensions of the collet nut ... and ill just drill a couple holes for a tommy bar wall thickness will be more then adequite

 

[bosephus]

Id like to say i made a whole bunch of progress today ... but nope not much at all .

I did get my blank sawn .. and a hole poked into it to get a boring bar in .
My little boring bar isnt going to be good for much other then roughing things in .. just to small and flexible .
So tomarow ill get the spindle end roughed in and set it aside untill i get some funds for a decent boring bar and a internal threading tool

 

[bosephus]

woo hoo progress is going to be made finally .

i ordered a new boring bar and threading tool from mesa tools to do my internal threads ... should be here tomorrow or the day after .
so i decided get set up and ready for them .

i got the stock back in the 4 jaw and went ahead and faced it off and cut the shoulder for the little keeper thingies that keep the chuck from spinning off in reverse .

isnt much progress .. but soon as my tools show up i plan on getting it fit to my spindle .

 

[bosephus]

gosh what fun it is to have proper tools .... new tools showed up , i could not be more pleased with them .

made some actual progress with this today , i got the spindle end bored out and threaded and ,


LOOK MA NO MORE CHUCK , threaded right on the spindle , register is very snug . i almost made the mistake of spinning it on tight .. but luckily i remembered i didn't have any means to loosen it yet .





one final flaw to my plans on finishing this .. i need an er40 collet to both make the nut and finish the chuck ... funds wont permit buying a set of collets for awhile
but if anyone has an orphan er40 sitting around id be happy buy it from you .

 

[Mark_f]

This should be interesting. I am going to follow this as one day I would like to make a collet chuck for my S B 9 lathe also. I plan on making everything but the collets and using american threads. Yours looks great so far. keep up the nice work.

Mark

 

[kd4gij]

Here is the one I made for my lathe. I used a standerd er40 nut for mine.

 

[bosephus]

well ... its now scrap metal .

decided to go ahead and thread it for the collet nut . things was going along great . untill my brain slipped a cog and i disengaged the half nut halfway threw the threading ... big no no on a g0602 and metric threads .
i did my best to try and re time everything ... but it didnt pan out .. so scrap metal

 

[Rbeckett]

Ouch, that hurts. Well you did learn something along the way that will make the second one the final one so it isn't really a loss, it was just practice for the final piece.

Bob

 

[Terrywerm]

OUCH!!! Sorry to hear about that! Give it a go a second time and it will come out perfect, watch and see!