My slow speed diamond disc lapping machine, the beginning

[Janderso]

I am thrilled!
I haven’t been all that successful at making concentric arbors or attaching parts to motor shafts that didn’t have some run out.
This baby runs perfect.
I’ll make the pilot/register when the diamond lapping discs arrive.
I still need to drill and tap the flange And mill the magnet pockets.
To be honest, this part was giving me anxiety. I can move on to the frame and platen.

 

[pdentrem]

Careful glueing in the magnets, I used epoxy and it must have expanded. Had to grind the magnets down to get them flush.
Greg

Put a small hole in the magnet pockets to allow adhesive to bleed out the back.
Pierre

 

[Janderso]

Put a small hole in the magnet pockets to allow adhesive to bleed out the back.
Pierre

Oh good idea!

 

[Janderso]

Careful glueing in the magnets, I used epoxy and it must have expanded. Had to grind the magnets down to get them flush.
Greg

If you used polyurethane glue, I can see this happening for sure.
I’m thinking locktite 603, I think. Whatever I have laying around.
Maybe epoxy is best. The pilot/breather hole should help.

 

[Janderso]

I decided to use JB weld. This particular product doesn’t expand much and holds extremely
well.
It’s an over night epoxy.

 

[francist]

Interested to see how this works. My experience with JB Weld and strong magnets is that it can produce some unexpected results. The iron powders in the epoxy do interesting things around the magnetic fields (remember school science and iron filings on bar magnets?) and the shape of the cured product can be quite different than what it started out as.

 

[DavidR8]

Interesting project Jeff. Are you modelling this after something you saw?

 

[Janderso]

Francist,
Now you have me worried
I checked this morning. All is stable and the magnets work well. It’s 12 hours of curing time.
These are the 6” discs.
Once I add the register it should be fine.
These small magnets pack a pull!. I had a tough time removing the disc.

 

[Janderso]

Interesting project Jeff. Are you modelling this after something you saw?

David,
A friend whipped one together for our scraping class, this design is modeled in part, after a design I recently saw.
There are several of these on YouTube that are DIY projects

 

[francist]

Now you have me worried

Sorry, didn’t mean to cause you grief. Looks like you’re good to go, maybe the volume wasn’t sufficient enough to be able move around. I just remember being totally baffled trying to figure out why my epoxy was climbing uphill! Glad it worked for you Jeff