Shopsmith 10e spindle and drill chuck runout question

cjlink · Post by **cjlink** » Thu Jan 10, 2013 8:18 pm

I recently picked up a 10E in decent shape. I have be spending this week cleaning it up and getting it ready for use. While I was at it; I decided to check the spindle runout. I was very happy to see that it is at <.003". Which is remarkable for a 64 yr old piece if equipment.

Next I decided to test the drill chuck runout. I first tested the bottom rim of the chuck, and it was at .005". I installed a straight drill rod into the chuck, I then measured 12 thousands " (yikes).
I then decided to try my mark V drill's chuck, and I measured exactly the same.

Have any if you guys measured your chucks runout? I am baffled. Is it the design of the taper shaft mount or could it be the quality of the Jacobs chuck?

backhertz · Post by **backhertz** » Thu Jan 10, 2013 8:22 pm

A good question for the 10E/ER group:
http://groups.yahoo.com/group/Shopsmith10ERusers/

JPG · Post by **JPG** » Thu Jan 10, 2013 8:45 pm

[quote="cjlink"]I recently picked up a 10E in decent shape. I have be spending this week cleaning it up and getting it ready for use. While I was at it]

Did ya tighten the chuck from all three holes?;)

The 'tapered flat' should not have any effect.

cjlink · Post by **cjlink** » Thu Jan 10, 2013 9:30 pm

I am wondering how much runout is common with the drill chucks? My mark v chuck is practically new, so I was suprised to measure the same amount of run out testing both chucks.

Has anyone else tested their chucks?

holsgo · Post by **holsgo** » Fri Jan 11, 2013 6:42 am

.003 magnifies each inch out of the chuck a piece is hanging. So, when the chuck is put on you are now at least one inch out from the spindle, add the bar and you might be another 1/2 inch or further depending on where you measure. Let's assume you, when everything is mounted, are 1 1/2 -2 inches beyond your measurement on the spindle. It's entirely possible for you to be 2-3 times the runout that far away. So based on that math, being .009-.010 runout makes sense.
Cure your runout with a piece of wood, hammer and DI. At the spindle measure the high and low spots at the tip of the spindle. Tap the wood held to the spindle lightly at the high spot. Re measure. Do over and over again until you are felling better about it. Reapply chuck and bar and measure.
I've been truing up my milling machine this way this week so I'm right in the middle of a similiar problem.

cjlink · Post by **cjlink** » Fri Jan 11, 2013 8:54 am

I agree that the runout is only going to increase the further out that you measure.

However From what I have read <.003" is within factory spec for the spindle. That is why I am asking if anyone has measured Thier chuck runout. These machines came with middle to lower end Jacob's chucks.

dusty · Post by **dusty** » Fri Jan 11, 2013 9:27 am

[quote="cjlink"]I recently picked up a 10E in decent shape. I have be spending this week cleaning it up and getting it ready for use. While I was at it]

I assume you are using a dial indicator but where are you taking your readings at (are you measuring off something that is chucked)??

cjlink · Post by **cjlink** » Fri Jan 11, 2013 10:00 am

Using a dial indicator, The spindle reading was done at the end of the spindle .002~.003".
The first chuck measurement was done on the end of the chuck body (I realize that this is not ideal) it was at .005".
The drill rod measurement was done at 1" below the chuck (.010"~ .012").

dusty · Post by **dusty** » Fri Jan 11, 2013 12:03 pm

I just chucked a drill rod and measured with the dial indicator on the drill rod immediately below the jaws of the chuck. I measured .002".

Without changing anything other than contact point, I measured .004". The dial indicator was on the drill rod 1" removed from the chuck jaws.

I don't know exactly what this tells me.

I turned the drill rod end for end and repeated the same tests with slightly worse results (about .0025 and 0045".

cjlink · Post by **cjlink** » Fri Jan 11, 2013 12:29 pm

Your results seem perfectly fine to me. I would expect to see those numbers.

I going to retest mine using a thinner drill rod to see if it makes a difference. I used a 3/8" rod in my first test, which is the same rod that I used ito test my floor mounted drill press.