2 X 48 Belt Grinder (again)

[rwm]

There should be clearance for the angle iron without a problem. I have actually added a 2.5" diameter protective washer to prevent the belt from every contacting the pulley carrier. The 2 x 1/2" aluminum bar will extend off the rear and there will be a tension spring attached to that. That will give me a 3:1 ratio on the belt tension.
Thanks for the pics Mark. I am planning something very similar. What are those table dimensions and are you happy with them?
R

 

[Mark_f]

There should be clearance for the angle iron without a problem. I have actually added a 2.5" diameter protective washer to prevent the belt from every contacting the pulley carrier. The 2 x 1/2" aluminum bar will extend off the rear and there will be a tension spring attached to that. That will give me a 3:1 ratio on the belt tension.
Thanks for the pics Mark. I am planning something very similar. What are those table dimensions and are you happy with them?
R

The table is 6 X 8. It is a nice size. I need to cut a slot for a miter gage yet.

 

[rwm]

That's larger than I thought. Oh...miter gauge. I didn't think of that. I may redesign!
R

 

[Mark_f]

That's larger than I thought. Oh...miter gauge. I didn't think of that. I may redesign!
R

Actually I cut to 4 X 6. It was 6 X 8. Both sizes are good. I made it from 3/8 aluminum, put a 45 angle on the edge to close the gap when tilted. My friend made a sander at the same time. I cut the miter slot in his. He left his 6 X 8.

 

[rwm]

I have been pondering this and I am thinking about a small miter gauge that attaches to the table with a thumbscrew. It would be useful for grinding tool bits and such.
Question: Do the plattens get hot? Is there any reason to heat sink them or something? Seems like they could get pretty hot at the speed I am planning. Could that shorten the life of the abrasive?
Robert

 

[Mark_f]

That is an excellent idea. I have seen this done on other grinder projects. I may do this because one reason I have not cut a miter gage slot is, I cut them on my bench grinder tables and they get grit in them and bind up the miter gage. I have to constantly clean the slots , even while using the miter gage. I have been pondering a solution and that is it. I had forgotten about this setup. It works great and there is just a couple small tapped holes in the table that won't bother anything. The miter gage slot sometimes is in the way grinding small parts. Thanks for reminding me of this.

 

[rwm]

I'm pretty darn excited! I just found out my motor mount is not perpendicular to the mounting face! And the bolt hole pattern is rotated with respect to the base mounting too! Awesome!
R

 

[rwm]

R

 

[rwm]

So the motor has a conduit box with a threaded hole on the bottom. The ID of the hole (minor axis of the thread) is about 0.715". That does not seem to correspond to any NPT fitting? What fitting would fit this? I was thinking 1/2 NPT but that may be too large.
Robert

 

[Mark_f]

So the motor has a conduit box with a threaded hole on the bottom. The ID of the hole (minor axis of the thread) is about 0.715". That does not seem to correspond to any NPT fitting? What fitting would fit this? I was thinking 1/2 NPT but that may be too large.
Robert

That is sized to fit an electrical connector such as a cord grip, or romex fitting. You can get a fitting at any DIY home center. It is considered a 1/2" electrical connector.