I have a MG9 grinder which came with the internal grinding attachment. It has one single arbor for holding ID grinding wheels which is obviously home made. I want to make a selection of arbors for the vaious grinding wheels that I have, it would help me a lot if I could get some pics and/or dimensions from anyone who has them.

The arbors have a steep cone that locates in the spindle and is held in with a collet nut.

Can anyone help me with this?

Regards

Pete.

I knocked up a quick and dirty arbor to get me through the job at hand. It worked appreciably well but since I didn't have a LH retainer I had to watch for the retaining screw coming loose.

Incidentally, I found an arbor in the box of bits that doesn't belong to my grinder, it's much too large. I have no idea what it fits but the taper is a very close fit so I'm guessing it might be for a MG12 or some other ID grinding head. If anyone can identify it let me know please. I've put the basic dims below.

Mine is the same design Andrew. You remove a cast iron name plate then bolt the internal head in it's place. Remove the belt cover and bolt a large cast ally pully to drive the head with a flat belt and fit a cast ally belt guard.

My arbor nut has a 5/8"-20tpi RH thread and passes through 0.442". Does that sound similar to yours? If so I'd love to get some pics/dims of whatever factory arbors you have.

Also, how are your wheels retained? LH screws?

Thanks Andrew. Your dims work out 3.486" / foot of taper my guess is that it's 3.5" / foot given the difficulty in measuring such things precisely.

I think that our ID grinding heads are very similar if not identical. The covers are obviously different because the MG9 motor is in the cabinet.

Regards

Pete