disc grinder motor

G

Greg Obach

Joined
Apr 16, 2003
Messages
501
hi
ok.. just got some money and i'm buying a motor for the k&g 9inch disc...

after checkin round town... the only name brand that came up was Baldor...
basically heres my choice...

L3509M which is a 1hp 3400 rpm motor...

FDL 3507M ..... is a 3/4 hp 1800rpm

FDL 3510M .....is a 1h/p 1800rpm motor...

and the prices are basically 235... 176 .... 213...


i've got the top motor on my 2by72 beltgrinder and have had no complaints at all..

which motor would be good for disc grinding blades... ?

appreciate any help

Greg
 
I'd try to find a nice (name brand) motor on ebay. I picked up a 1 hp DC motor with controller and mechanical brake for $150. Took the brake off and sold it on ebay for $90.
Variable speed is a big plus.
 
Of the ones you list, I'd go with this one.
"FDL 3507M ..... is a 3/4 hp 1800rpm".

I used 1HP 1800 RPM TEFC motors when I was using AC motors. You really don't need that much, so 3/4 will be fine.

Make sure it's a totally enclosed fan cooled(TEFC) motor or you will have problems fairly soon from metal particles in the windings and interior switch. Ask if it's a reversible motor if you want that feature. You have to get a switch for that to hook it up properly
 
Yep...ditto on what Mike said, Get the slower motor and you don't need tons of power...reversible is very nice.

-Rob
 
thank you for the responses...

i appreciate it alot .... and i'll get the 3/4hp.. and a switch to reverse

Greg
 
Greg Obach said:
Hi Mike

the disc is this one from K & G.... its a 9 inch steel disc...

http://www.knifeandgun.com/catalog/9__sanding_disc_1530838.htm

no micarta ... just the a 60 grit aluminium oxide psa disc on it...


i love it..... shoulda made one years ago...

Greg
Click to expand...

Ah, OK. I guess it was just the angle of the shot. I have the same kind on one of my motors. The one on the right. It's a little dark and hard to make out.
 
very nice set up.........with speed controllers too !!

excellent set up...

i'm saving my bucks for one

thanks for the pic
Greg
 
I know I must have read something wrong - 80 dollars for a 9" wheel? Couldn't one buy a (cheap) belt sander with that much money!?!?!?
Interesting,
I don't own any sort of stationary sanding or grinding equipment, though I do have an angle grinder.
Can most of the work done on a belt sander be done on one of these? I ask simply because it looks many times easier to build.

Or before I waste time and money on that, should I just get a bench grinder?
Sorry for sort of hijacking your thread, I'll try to find somethine more useful to say about these :)
 
Hi Cando

yes you could buy a cheap one..... and i had one of those 1x30 belt and disc combo grinders... and it didn't do as nice a job as the thick steel disc... .. the 3/4hp motor keeps that disc spinning fast under pressure.... and i didn't feel that the steel disc was heating up at all... unlike my thin aluminum one...

well.... the belt grinder is excellent for hogging off material .... you have alot of fresh stone on the 2x72 belt... so it cuts real good

the disc makes everything very flat.... and with the 60 grit aluminium oxide, i wouldn't be the least suprised if you can grind out bevels with it ....

i'd get the disc grinder before a bench grinder.... the disc is geared more towards knife making..

besides..........i've heard that you can use normal sheet abrasive on them with 3m spray... so you can make your own discs with the 9inch...


take care
Greg
 
Mike

I seen serveral multi-function buildings in my time, but that must be the world's first workshop and art gallery! :cool:
 
Thanks Greg and congratulations on your success!

I'm not sure what I was thinking... If I make a disc sander, switching it back and forth to a bench grinder shouldn't take much work at all.
Because I'm looking to spend almost no money on this, it's going to take a long while to complete. I'll be looking out for any motors to pass my way though :)

EDIT:
Will most motors work, if not necessarily that well. Such as ones from treadmills, shop vacuums, dishwashers etc. given that they have high enough ratings?
Also, just to make sure that I have the right idea of what this tool can do: Is this suitable for shaping steel which has been very roughly cut out with an angle grinder? Or is this soley for finishing work?
 
Hi Cando

well... i'd look out for a larger motor... bout 3/4 hp.... something out of a washing machine, dryer, or treadmill... these won't be totally enclosed motors like the one i bought..... so you'll have to make a dust proof box around it... or the grinding dust will eat away at the insides..

also.....if you want to do things cheap... you can pick up an aluminium disc from some supply outfits...... like "Busy bee tools" .... i saw one there for 15 to 18 bucks.. ... think its a 10 inch...
-- also grizzly has one forsale too..

--- the value of a Disc grinder :
one of the most important things about a knife is that its straight..... even a complete noob will pick up your homemade knife and site down it to see if it is straight... .... this is where a disc grinder will shine.... it will easily straighten
up the spine and line up the bevels....
-- the alternative is to drawfile everything flat or use a belt grinder....

i believe you could shape steel with it...... i bet you could grind out a skinner quite fast with one..... and nice and flat skinner that is...

it's also good at flattening handle scales that you cut yourself... ... ..its a good tool to have.... trust me on that...

Greg
 
Nice to get that all straightened out, thanks again.
Today I came across an old black and decker blower/vac. It was 12 amps (which I know is not an actual power rating). Anyway, it was two dollars and not knowing if it worked or not, I passed it up. Well, I'll keep looking...
 
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