• Hi - We're having intermittent forum issues. Posts, alerts, and anything involving email like signing up or password changes are having problems but not for everyone or everywhere. Josh is working on it. No ETA right now. Thanks Josh - BTW this is a volunteer forum so SLA's are just best effort. EDIT -> I manually batch updated about 25 people stuck on the email notification. Try logging in now with your password. EDIT -> May 8/23. I updated another bunch of users stuck on email notifications. Try to login if you are stuck. If you really can't get in contact us on facebook or if you know a forum member get them to ask us.
  • [Ad-Free Experience]
    Register Today, Craft a Post, and Enjoy an No-Advertising Experience.
    Click Here to Register

Truing a 12" sanding disc: YYC

This is the downside to posting videos directly: there's 8000 (well not literally) codecs and formats. The other downside is that you dont know whats in the zipfile from a virus perspective - this mostly affects windows users


A bunch of us can reface your disc. You could make a static balancer out of bearings and blocks, which will get you very close. There qreat ways to preserve the dynamic balance, but that will depend on how material is taken off. (large decision tree type stuff).

The best thing is to mount it on the lathe true to the bore and measure with a plunge or test indicator how out of true it is. The short story is if you are taking out a skim at one position (say 3 o'clock), you take off the BACK a similar amount of metal on the opposing side (for instance 9 o'clock).

There are shops that will dynamically balance it for you, but that will cost you more than the plate is worth.
There are shops that will dynamically balance it for you, but that will cost you more than the plate is worth.

Getting a crankshaft balanced is only a couple hundred bucks isnt it?

Replacement discs, if I can find one, will run me $100 on ebay.

A new combo 6x48 belt/12" disc stationary sander of this quality will run me 800+, used if I can find one is north of $300. I paid $60 for the unit and have spent maybe $40 on bearings and bits to refurb it. I've got some space budget-wise to get it into good running condition.
Last edited:
Neighbour just bought a craftex cx709 - we're going to try and skim a bit off the face to true it up to the bore. I found a driveline service place that figures they can rebalance the disc for $50 if they dont have to add metal - wont know for sure until they get it on the balancer, but worst case is I'm out $50 for them to try.