Modification questions on new Cheap Grinder

D

Dt_Trainer

Joined
Nov 8, 1999
Messages
103
I just bought a 6x48 Inch Belt Sander with a 9 inch Disc Sander. It is a Cheap Chinese Made belt sander but it is built pretty rugged and has a nice metal stand that I assembled.

I bought because it was the proper size I was looking for, it was in my budget and finally it had a ¾ horse power motor. The motor is running at 1720 R.P.M’s 110-120 volts, 60hz.

When I got it all set up I turned it on and started flat sanding some blanks and was less that satisfied with the results. The belt sander is not aggressive at all, I was able to get some work done but I was also easily able to almost stop the motor and was not working it hard.

I realize that at 1720 the motor is going to be slower but I figured that the ¾ horse power would make the belt sander work a little harder.

The disc sander on the other hand is a really good runner I suspect because it’s only 9” verses the 48” belt.

Here are my questions I paid about $180. for the belt sander so it wasn’t a huge strain on my budget but I don’t really want to sink another $100. in it if I don’t have to.

1. The motor running the two tools is feeding the spindle on a v-belt. It is on a pulley about 2 inches in diameter. The pulley on the spindle is also about the same size. I am guessing one fix might be to make the pulley on the spindle larger to change the ratio and therefore get myself some more R.P.M.’S for the belt.

2. If I do have to get say a 1HP motor and replace the ¾ hp motor should I get a 3450.

Any suggestions would be greatly appreciated.

Jim


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The warrior will endure great personal hardship in order to stand on a hill, howl at the moon, and proclaim his domain over all he surveys. Fredrick Lovert- Author
 
i have a leeson 1.5hp variable speed motor, the max speed is 1725. it's a very powerful motor, i can't slow it at all when grinding, but it's $530.
i suggest you look for a 1.5-2hp motor. leeson and baldor make the best motors, single speed motors are less expensive than the variable speed motor i bought.
you may not need to change the motor, before you do make sure your v-belt isn't what's slipping.
i like 1725 for grinding, 3450 makes the steel get hot faster, and isn't as easy to control.

[This message has been edited by magnum .44 (edited 07-13-2000).]
 
I found a place were you can get 2 hp variable speed motors by lesson for 112
and the Variable speed drive for 289
that is cheap for a variable speed motor
with control. need more info email me
 
I have a 6X48 grinder that I use to flatten scales such as stag, water buffalo and sheep horn. I found this to be too slow which translated into non-agressive. Instead of investing money in another motor, I just bought a larger pulley and put it on the motor end. This increased the speed considerably and now I am a happy camper for less than 5 bucks!

C Wilkins
 
I plan on buying a new pulley wheel for the grinder to improve the power to tool ratio, and I checked the v-belt and it is so loose that I can touch the belt together in the middle between the motor and the spindle.

I will also be tightening the belt or replacing it for a smaller one.

If I do update the motor I will definately look in to the leason motors thanks Nathan.

As always I am sure all of this free information has just saved me a couple months of screw ups tring to fix the problem.

Jim

I appreciate all of the suggestions

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The warrior will endure great personal hardship in order to stand on a hill, howl at the moon, and proclaim his domain over all he surveys. Fredrick Lovert- Author
 
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