Freeing up a stuck spindle nut

TDPurcell · Jul 14, 2021

I’ve got a Boyar-Schultz 612 surface grinder, and it appears that the wheel adaptor is secured onto the spindle with a slotted nut as shown in the pic. I found a spanner wrench at MSC that will fit the slotted nut. However, the nut is seized onto the spindle and won’t budge with the wrench. Does anyone have any tips and tricks for freeing up a nut like this? The only thing I’ve tried so far is WD40. Also, I’m assuming it is right handed thread.

I appreciate any tips or advise. Thanks.

Sent from my iPhone using Tapatalk

easymike299 · Jul 15, 2021

It's probably 1/2-13 Left hand

dalmatiangirl61 · Jul 15, 2021

WD40 is a poor penetrant, PB is better, and Kroil even better again. Have you tried applying some heat to the nut?

How about a custom socket that you can use with an impact driver?

ballen · Jul 15, 2021

TDPurcell said:
Also, I’m assuming it is right handed thread.

That's the problem: it's left handed.

TDPurcell · Jul 15, 2021

Thanks for the replies.

Sent from my iPhone using Tapatalk

TDPurcell · Jul 15, 2021

I got it free with atf/acetone mixture, a little heat, and turning it in the correct direction. (Left handed thread as stated). Thanks.

Sent from my iPhone using Tapatalk

Hillside Fab · Jul 16, 2021

FYI, most grinder spindles are LH, but you can actually see the thread direction in the first pic posted to this thread.

ballen · Jul 16, 2021

If you don't have a puller to remove the flange/hub from the taper, it's time to make one. Start with a short length of aluminium round stock. Bore a blind hole and thread the ID to screw easily over the pulling threads on the flange. Then drill and tap the blind end for a reasonable size bolt (say 1/4-20 since you are in the US) to push against the spindle.

Search

Largest Manufacturing Technology Community on the Web

Search

Freeing up a stuck spindle nut

TDPurcell

Plastic

easymike299

Cast Iron

dalmatiangirl61

Diamond

ballen

Diamond

TDPurcell

Plastic

TDPurcell

Plastic

Hillside Fab

Cast Iron

ballen

Diamond

Similar threads