It all depends on what you make with it. For our daily hobby things, pretty much anything works just fine. For NASA, different story, and many shades in between.?
On the chuck you showed, you lose the most important advantage: being able to feed stock though the chuck because the 3MT taper arbor fills out the through-spindle hole. That might work fine for hobby work.?
You are starting to get the trend? Everything is shades of grey and what might work for some may not work for others.?
Andrei
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Why bother with adjustments? I like the ?no adjustment?needed.
Ralph
On Thu, Apr 23, 2020 at 2:37 PM Jody <
jp4lsu@...> wrote:
Thanks for the explanation Andrei.? I knew there were chucks with those true features.? I don't think I've seen a collet chuck with the feature.
So basically you have a 2 piece collet chuck.? One (adaptor) that goes on spindle then the actual chuck that can be adjusted? on the adaptor.
-Jody
Sent via the Samsung Galaxy S10+, an AT&T 5G Evolution capable smartphone
-------- Original message --------
Date: 4/23/20 12:22 PM (GMT-06:00)
Subject: Re: [atlas-craftsman IO] Making an ER40 Collet Chuck
Jody,
the set-true feature is like a 4-jaw chuck adjustment, but at the chuck/plate connection, instead of the chuck jaws.?
It is comprised of 4 set-screws located at 90 degrees from each other. They screw in from the outside of the chuck and they press on the registration boss on the adapter plate. Effectively, they allow you to indicate your chuck while attached to the spindle.
once your indicator is close to perfect, you tighten the mounting bolts and you are done.
You can make your first chuck without this feature. Just machine the adapter plate as per instructions (usually, skim the faces of the registration boss and backing surface, the same amount!), drill the mounting holes, install the ER40 chuck and you are
done.?
You can always add the set-true feature later, if you want to have a simpler project to start with.?
Thanks Bill, I'm not familiar with that feature.? I'll check out the link
-Jody
Sent via the Samsung Galaxy S10+, an AT&T 5G Evolution capable smartphone
-------- Original message --------
Date: 4/23/20 11:31 AM (GMT-06:00)
Subject: Re: [atlas-craftsman IO] Making an ER40 Collet Chuck
Jody:
Not sure if you're considering building a "set-tru" feature into your ER40 chuck, but if you are,
with drawings for doing so.
I used the drawings for building a "set-tru" 5C collet chuck, and it turned out pretty well.?
Bill
