How does Steel Sanding Disc attach to arbor?

freedomlives · Post by **freedomlives** » Tue Oct 22, 2013 4:06 pm

I bought on eBay just the arbor that the steel sanding disk attaches to (http://www.ebay.com/itm/190893827833). Mainly because it saved my mother several pounds in the luggage to bring it over to Slovakia when she came to visit. As can be seen in the photos on eBay, it has 4 holes, which are 1/8" threaded with countersinks on apparently the wrong side.

I imagine that the steel disk would have countersinks in it, then screws would pass through to the arbor, but why on earth does the arbor have those countersinks on that side?

I've got some steel plate which a friend can turn on his lathe to fit the arbor...

beeg · Post by **beeg** » Tue Oct 22, 2013 4:42 pm

Can ya post a pic of the arbor since the ebay item has been removed?

rpd · Post by **rpd** » Tue Oct 22, 2013 5:14 pm

The eBay item number is correct but a trailing bracket got included in the link.

Here are the photos.

[ATTACH]23060[/ATTACH]

[ATTACH]23061[/ATTACH]

SDSSmith · Post by **SDSSmith** » Tue Oct 22, 2013 5:48 pm

freedomlives wrote:I bought on eBay just the arbor that the steel sanding disk attaches to (http://www.ebay.com/itm/190893827833). Mainly because it saved my mother several pounds in the luggage to bring it over to Slovakia when she came to visit. As can be seen in the photos on eBay, it has 4 holes, which are 1/8" threaded with countersinks on apparently the wrong side.

I imagine that the steel disk would have countersinks in it, then screws would pass through to the arbor, but why on earth does the arbor have those countersinks on that side?

I've got some steel plate which a friend can turn on his lathe to fit the arbor...

The steel disc has four corresponding holes (to the arbor/hub) that have been counter sunk to accept socket style flat head machine screws.

JPG · Post by **JPG** » Tue Oct 22, 2013 10:37 pm

The tapered part of the screw head is 'thicker' than the steel plate(disk). The csink in the arbor should match the screw taper when tightened. The disk thickness and countersink depth will affect the match up.

freedomlives · Post by **freedomlives** » Wed Oct 23, 2013 2:19 am

Thanks- that makes sense. Happily I have found a source for self adhesive sandpaper disks here.

Just, on account of a lack of the proper screws, I'll tap the holes out for M5 screws.