Combine a 2x72 belt grinder & 9" disc ??

[rabler]

Pondering while reading this:
I will build a stand so accessing both sides is feasible. I prefer to keep benches clear. The table for the disc is definitely a compromise, as @keeena noted with asymmetric support. I guess a disc would be useful for slightly larger faces if you are trying to maintain a somewhat flat face, thinking of sanding the faces of a 4x4” cube. Not sure how much of that kind of work I’d encounter.

The other thing that just occurred to me is that a disc could use a guard as it will probably otherwise spray grindings in a big arc.

I think I’ll incorporate the mounting collar for the disc table when I build the central part, but otherwise leave the disc unbuilt. I can easily add it later, just make the necessary parts.

 

[C-Bag]

I have a MultiTool mounted on a 6” Jet bench grinder. It has a wire wheel on the opposite side and the MultiTool has a horizontal 3x36” belt with a 9” disk sander. I took the floppy hard to adjust table off the disk sander. I don’t even leave the belt mounted as it’s crazy easy to take on and off if needed. I have a dedicated tool grinders so the belt is only used for special projects.

I use the sanding disk and wire wheel for shaping and deburring constantly. It is all about what you do and how you like to work I guess.

 

[Bi11Hudson]

Such a device exists at a larger scale for use in woodworking. My personal position is that when you want to build a tool as opposed to buying one, do it. In this case, the erection drawings alone will make it worth the effort even if it never gets built. The building is a way to prove the design. In any case, as a learning experience it would be invaluable. Any use as a working tool in the future is secondary, pure "velvet".

.

 

[Pierre52]

You may want to contemplate this design by Jer Schmidt that allows the normally vertical belt to rotate 90 degrees. This is a smart young kid who has now updated his original design and sells a complete build guide and plans for a very reasonable price.

He runs the machine on a VFD so can get very precise control of speed.

I have a separate 12" diameter Disc sander that runs at a much lower RPM than my belt sander. For that and all the reasons listed above I'm not so sure that disc and belt are compatible.

 

[Christianstark]

Question for the folks commenting on this, and the OP.

I am also starting to plan on a belt grinder per Phil V. plans. Will wind up being 3 x 79 inch belts as the instructions are metric.

The question is, what is the benefit for going 3 phase VFD here? I ask because the area where I will be running this only has 110V now, and although I DO plan or running 220V there, I don't have it currently. I want to keep my grinding area away from my milling and lathe area, so I am planning on using my exterior entry shop for that, and keeping my inside the basement area for chips only. Is it worth the hassle of 220/VFD?

Here is the 110V motor I was considering.

https://cdn.automationdirect.com/static/specs/ironhorsesprs.pdf

 

[dkemppai]

I've been fooling around with building a belt grinder, mostly muddling it over. Finally decided (New Years resolution) to use it as a project to teach myself FreeCad. I came up with the following idea, combining a belt grinder and disc sander. Maybe a boondoggle?

Hmmmm,

So, I've been pondering a disc sander attachment for my belt sander. Just a tooling arm with a bearing block and another wheel. Would use a serpentine belt, or industrial J belt to drive it off the existing hardware. Then take it off like any other tool. On the plus side you could actually have to discs. One flat, and one tapered a degree or two.

Dan

 

[rabler]

You may want to contemplate this design by Jer Schmidt that allows the normally vertical belt to rotate 90 degrees. This is a smart young kid who has now updated his original design and sells a complete build guide and plans for a very reasonable price.

He runs the machine on a VFD so can get very precise control of speed.

I’m doing a pivoting base to accomplish that too, slightly different design but same end result.

 

[rabler]

Question for the folks commenting on this, and the OP.

I am also starting to plan on a belt grinder per Phil V. plans. Will wind up being 3 x 79 inch belts as the instructions are metric.

The question is, what is the benefit for going 3 phase VFD here? I ask because the area where I will be running this only has 110V now, and although I DO plan or running 220V there, I don't have it currently. I want to keep my grinding area away from my milling and lathe area, so I am planning on using my exterior entry shop for that, and keeping my inside the basement area for chips only. Is it worth the hassle of 220/VFD?

Here is the 110V motor I was considering.

https://cdn.automationdirect.com/static/specs/ironhorsesprs.pdf

A VFD means adjustable speed, which is not really an option on a single phase motor. Not having used a belt grinder for metal I’m not sure how much benefit that adds, but it is the route I’m going. There are Teco L510 (and surely others) that will run a 3phase 220v motor on single phase 120V for low HP motors, up to max for Teco of 1HP using the L510-101-H1. I’m going to 2 HP which would overload a 120V 20a circuit, 220 is required.

I certainly agree with keeping grinding away from machines.

 

[dkemppai]

A VFD means adjustable speed, which is not really an option on a single phase motor. Not having used a belt grinder for metal I’m not sure how much benefit that adds, but it is the route I’m going.

After having a belt grinder with VFD, I wouldn't be without the variable speed. A majority of the time I run the belts under the maximum speed of my machine. A lot of time it's near 10% or 20%, like 'hand sanding' on a machine. It's really nice for detailed finishing, in that it allows you to work slower. However some ceramic belts perform better with high speed and high loads, so you need to watch the belt selection.

I would think that 2HP is a good choice. Although it may be hard to use all 2HP on a belt grinder. With a metal drive wheel, there's a good chance you'll get belt slippage before stalling the motor.

 

[Christianstark]

A VFD means adjustable speed, which is not really an option on a single phase motor. Not having used a belt grinder for metal I’m not sure how much benefit that adds, but it is the route I’m going. There are Teco L510 (and surely others) that will run a 3phase 220v motor on single phase 120V for low HP motors, up to max for Teco of 1HP using the L510-101-H1. I’m going to 2 HP which would overload a 120V 20a circuit, 220 is required.

I certainly agree with keeping grinding away from machines.

Im kind of new to all this. I think my confusion comes from seeing my bench grinder with 110V and variable speed.