Which 9" disc grinder/system to get?

B

Brian.Evans

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Well, I bought Chris Bowden's Wilmont TAG101, so I'm set with regard to a full size grinder. He's sending a new three phase motor with a bent shaft with the grinder, so I'd like to get the shaft replaced and make it into a variable speed disc. I'm not real up on them though. Which ones should I be looking at? I think this will round out my knife making tools for a little while so I'd like to get a decent one.

While I'm at it, I need a 7/16" metal shaft small wheel and a 3/4" small wheel. USA Knifemaker or ??
 
I think the Beaumont/KMG small wheels are the best. I like the bearings on the end and the ease of changing the wheels. I have 1/4" thru about 1 1/2" and I am very happy with them. I think you can buy them direct from Beaumont or thru some distributors, who ever has them in stock.

Tim
 
I think the OP is asking about seaparate 9" disc grinder.

When you have a new shaft you can get a 9" disc from several places, including Beaumont. You have a choice of a 9" flat or 9" beveled. Both will take standard 9x11 abrasive sheets, which saves money over buying abrasive discs. Nielsen makes a great system that utilizes a disc/hub with magnets that hold removable 9" discs, either beveled flat, and a special disc with a thinner beveled back edge. You can change discs or grits pretty quick with that.

What HP is the motor? If 1 HP you can get by with a KBAC 24D VFD. You only need 115V for that. More HP and you will need the 27D. With the 27D you can still use 115v input but that will limit you to 1.5 HP even with a 2 HP motor.

If the motor has a 56C frame (mostly used for pumps) you can use the Beaumont tool rest. Most experienced makers seem to indicate you don't need a tool rest for knives though.
 
More info.

The motor is a 1.5 hp. It was originally on the grinder when Chris bought it. Wilmont sent him a replacement motor and told him to keep the bent one. I'm going to run it off the same vfd as my grinder. Work rests are nice for dove tailing bolsters and squaring up bolsters and scales, but I won't be using it for that very often, if at all.

The grinder already has a.small wheel attachment. I'd like to find used wheels to save some money, but that is probably pretty wise, pound foolish at this point.
 
Which VFD is the grinder using?

Talk with an electrician about the best way to wire it. There are several ways it can be done. Using relays in some methods leaves you vulnerable to baking the VFD if a relay fails.

A very safe way is wiring the VFD to one recepticle so you can plug in the one machine you want to use at a time.
 
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When I finally get around to getting one, I will get a motor and VFD wherever I can find it the cheapest but the disc will definitely come from Nathan Carothers (Nathanthemachinist). EVERYTHING he builds is absolute top shelf.
 
darrin sanders said:
When I finally get around to getting one, I will get a motor and VFD wherever I can find it the cheapest but the disc will definitely come from Nathan Carothers (Nathanthemachinist). EVERYTHING he builds is absolute top shelf.
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Darrin, I believe he said this last batch was it for his discs because he basically didn't make hardly any money. They were awfully sharp though, weren't they?
 
At one time I had four separate discs with four separate motors. They weren't great. If I had had speed control on each well I believe that would have been okay. I put those aside and much later I now ended up with a Nielson magnetic hub with six or seven separate discs and a variable speed drive. It simply is a super machine! If you want the best then this is the machine for you. Frank
 
Frank, I have the Nielsen system also but have two regular discs and two of the newer thinner discs..all work great. Larry
 
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