LumberJocks

tolerance on a drill press

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by Paul posted 12-24-2011 03:35 AM 2411 views 0 times favorited 9 replies Add to Favorites Watch
View Paul's profile

Paul

224 posts in 2916 days


12-24-2011 03:35 AM

I have an older Craftsman drill press that has to much wobble at the bit for me. I have removed the part the chuck mounts to (quill or arbor not sure what it’s called) and finally removed the chuck.
I put a dial indicator on the chuck before removing it and the needle was all over the place.
I pulled the chuck and put the tapered shaft back in the drill and put the gauge back on the quill. I have 2-3 hundreds of an inch wobble with the old bearings while the motor is engaged. In my hand the bearings don’t feel bad but I’m sure I wouldn’t be able to feel that anyway. I have them out so I will change them.
Ideally there would be no wobble on the shaft but that’s not the case here.
Have any of you guys put a dial meter on your drill press? If so do you remember the results? how much is too much?


9 replies so far

View DBerryhill's profile

DBerryhill

5 posts in 1810 days


#1 posted 12-24-2011 04:13 AM

I recently saw an article that may help if your drill press is of similar construction:
http://email.villagepress.com/pub/HSM/20111207/20111207.html
You add a washer or bushing to the top of the quill to keep it centered inside of the pulley shaft.

I hope this helps.

View Paul's profile

Paul

224 posts in 2916 days


#2 posted 12-24-2011 03:23 PM

Under examination I also see that my motor pully is in need of a change. It has no balance holes and it has a slight wobble. when I spin the motor without the belt but with the pully it vibrates some. I pulled that pully off the motor and and the vibration is gone. Motor is fine.
So first thing is to get a new set of pullies or al least a new motor pully.
I want to take apart the chuck and clean it out while I have it off. I have oiled it and worked it looser than it was but it could use a good cleaning. I have to have the sleeve pressed off so I can get to the jaws and the ring nut halves.
I wonder if my bench vice has enough strength to press off the sleeve?
With the motor switched off ( so less pully vibration) and a constant hand turn of the belt while on both pullies I now see just 1/100th inch runout. I haven’t checked it with the belt off and just a manual turn of the spindle/shaft.
Every time I see someone turn on a drill press on the computer or tv I can’t help but notice how smoothly their chuck spins. Getting this drill straight has been something I have been wanting to do for a while.

View Lee Barker's profile

Lee Barker

2170 posts in 2314 days


#3 posted 12-24-2011 06:03 PM

Attaboys to you for tackling this rather than letting it negatively affect your work.

Pulleys: For a few extra bucks you can get good ones from an implement or power transmission place.

Belts: Same deal. Cheap belts can cause vibration without any effort on their part.

The Chuck: A friend who owned a machine shop said they replaced all their drill press chucks annually. Period.

Here’s what MSC has to offer.

I have 9 drill presses in my shop, which in no way makes me an expert except that I know that they can become orphan tools, ignored, sometimes not used for weeks at a time. That doesn’t mean that a little investment aimed at precision would be misspent. It seems to me that every time I work on a tool, especially to increase precision, I learn something that applies to the next similar event. My confidence to tackles these things improves as well.

Kindly,

Lee

-- "...in his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View IrreverentJack's profile

IrreverentJack

724 posts in 2307 days


#4 posted 12-24-2011 08:06 PM

I put a dial indicator on my drill press. I don’t remember how many hundredths out it was but it was more than a revolution. I haven’t pulled it apart yet, but I did find this link. Hope it helps you. -Jack

View IrreverentJack's profile

IrreverentJack

724 posts in 2307 days


#5 posted 12-24-2011 08:25 PM

Lee, I’m thinking a cast-off chuck from a machine shop would be fine for my DP. Any ideas on how to tell if a used chuck is any good? $100 for a new 5/8 chuck would be difficult at the moment. Thank you. -Jack

View Paul's profile

Paul

224 posts in 2916 days


#6 posted 12-24-2011 11:08 PM

So a new chuck has entered my mind. Has anyone changed over to a keyless chuck? are they inferior they keyed chucks? Then the next question is if you go keyless how do you stop the spindle from turning while locking and unlocking a bit?

View Paul's profile

Paul

224 posts in 2916 days


#7 posted 12-26-2011 10:36 PM

Ok,
so it turns out Craftsman no longer has the pulleys for this drill press.
Mfr date 1977. They are stamped St Louis Diecasting.
Where do I go, Grainger?
anyplace on line that I can order these pulleys from? I’ve done a search and don’t see any listed on the MSC site. they’re either too complicated to list or they just don’t sell any. No one working 12/26 so I can’t call in.
Lee you suggested a power transmission place. Do you mean an automobile transmission shop? why would they have these?
Much appreciated
Paul

View Dusty56's profile

Dusty56

11806 posts in 3152 days


#8 posted 12-26-2011 10:59 PM

Did you mean thousandths of an inch or hundredths , as typed ? Big difference !
Using a magnetic based dial indicator , I put a drill center into my chuck and set the indicator point against the center. I applied pressure to the chuck and watched for movement of the dial needle. Less than a thousandth on my new JET DP , no matter where I checked for play. Reason for using the drill center is that it is perfectly round so you’re not measuring the outside of the chuck , etc.. However , I didn’t even need an indicator for my old DP , because I could physically see and feel the amount it moved sideways, leading to out of round holes , etc..
Center Drill , just in case you’ve never seen one : )
http://tool.wttool.com/tools/Center%20Drill
Also , Not auto transmission…but transmission of power via belts / pulleys / chains / gears , etc.. : )

-- I'm absolutely positive that I couldn't be more uncertain!

View able339's profile

able339

47 posts in 1839 days


#9 posted 12-26-2011 11:31 PM

Personally, I like an Albright (?) chuck. It is keyless which is what i like most and it runs true. It is not a wallet buster either.

-- TNJames

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com