I have a 9A Southbend lathe from 1947. Just finished the refurb. and just have to wire and level it. Anyway I'm about to consider a set of collets for it. I already own a set of 5C collet holders for the 3 and 4 jaw chucks. What I'm wondering, are the newer 32ER or 40ER collets any better than 5C or for that matter the original 3C ?
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collets?
- Thread starter sbburke
- Start date
- Replies 8
- Views 1,925
metalmaster10
Stainless
- Joined
- Apr 18, 2012
- Location
- Indiana, USA
I would say that the ER collets might be a touch more accurate. However, they are usually not used for the same things. I guess I’m a little confused about the question. Are you wanting them for workholding or toolholding?
aametalmaster
Diamond
- Joined
- Jan 11, 2005
- Location
- Salem, Ohio
ER collets are just fine for work holding. You can get ready made ER 32 chucks from tallgrass tools or Jeff tools4cheap. I made the first ER 40 chuck and love it. I can do so much more that i can in some chucks esp on the small tender parts...Bob
http://www.practicalmachinist.com/vb/members/aametalmaster/albums/er40-collet-chuck/
http://www.practicalmachinist.com/vb/members/aametalmaster/albums/er40-collet-chuck/
Jaddamasa
Plastic
- Joined
- Jan 6, 2013
- Location
- Bergen-norway
As I understand it 3C needs a draw tube reducing the size to 1/2 inch. ER 32 and 5c are available as spindle chucks and will give you whatever your spindle bore is.
I use a ER32 chuck from Chronos UK. Made for Boxford.
After a bit of fitting I'm happy with it.
Yngvar
I use a ER32 chuck from Chronos UK. Made for Boxford.
After a bit of fitting I'm happy with it.
Yngvar
Last edited:
Thank You guys for a timely response. The SB9A has a spindle with a #3 morse taper. The collet chucks that I've seen are available to fit in there as a complete set, as in chuck and 18 collets. I was just wondering if there is any advantage of the 5C over the ER 32 or 40, or vice-versa. Also as a newbie kinda guy (to machining) I don't understand the "32" in ER 32 or ER 40. Are they referring to 32 millimeters? Rich
jkopel
Stainless
- Joined
- Apr 3, 2010
- Location
- Seattle, Wa USA
The MT 3 collet holders are designed for tool holding only!
They don't have a through hole.
If you want to use ER collets look at the collet chuck aametalmaster built (the link in his post).
That is what you want!
Josh
They don't have a through hole.
If you want to use ER collets look at the collet chuck aametalmaster built (the link in his post).
That is what you want!
Josh
aametalmaster
Diamond
- Joined
- Jan 11, 2005
- Location
- Salem, Ohio
Here is the lowdown on the ER series collets which might help with the question...Bob
ER40 Collets Individual Metric and Imperial Sizes - MariTool
Thank You, Bob. That is what I was wondering. And by the way that is a beautiful collet chuck. When I get set up and running, that will probably be one of my first or second of the 6000+ jobs that are developing for this old machine and old machinist wannabe. Rich
