bmikkalson
Hot Rolled
- Joined
- Jan 20, 2010
- Location
- St, Paul MN
Hi, I have a large industrial angle sander with a rpm of 1750. Is it possible to convert easily to say 3500 rpm for grinding? Maybe be a clip here and a poke their....
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Possible to magicly convert a 1750 rpm angle grinder into say 3500??
- Thread starter bmikkalson
- Start date
- Replies 53
- Views 8,354
- Status
SteveF
Titanium
- Joined
- Jul 4, 2004
- Location
- central NC
What are you trying to grind that you feel can't be done at 1750?
Steve
Steve
moonlight machine
Diamond
- Joined
- Nov 19, 2007
- Location
- marysville ohio
Hi, I have a large industrial angle sander with a rpm of 1750. Is it possible to convert easily to say 3500 rpm for grinding? Maybe be a clip here and a poke their....
You put that one away and break out some $ and buy the 3500 rpm grinder. see, it's easy!
Hi, I have a large industrial angle sander with a rpm of 1750. Is it possible to convert easily to say 3500 rpm for grinding? Maybe be a clip here and a poke their....
.
Such a tool is likely fitted with an AC/DC universal brush type motor. No load rpm follows applied voltage in general. Double the applied voltage to achieve your rpm objectives. You will need to figure out a way to cool the windings to keep them from burning through
bmikkalson
Hot Rolled
- Joined
- Jan 20, 2010
- Location
- St, Paul MN
I'm in a huge hurry, and my welding skills suck.
bmikkalson
Hot Rolled
- Joined
- Jan 20, 2010
- Location
- St, Paul MN
Its a huge old black and decker, It looks like you could get the unit in 3500 rpm. Perhaps there is a resister in side?????
jscpm
Titanium
- Joined
- May 4, 2010
- Location
- Cambridge, MA
There is a statistical correlation between doing weird things with angle grinders and having accidents. 
hobbyman
Hot Rolled
- Joined
- Oct 30, 2011
- Location
- Canada, BC
You are going about it the wrong way. What you need to do is shop for a fast cutting grinding disc. Avoid promotions that guarantee long life. You have to look at the listings. I have suffered for years in shops where owners ordered hard long lasting wheels and they also don't grind very well. They certainly wear out grinder motors as people push and press then in frustration discard/hide the wheel and get a new one.
A fast cutting wheel will go from seven inch down to five inch in about an hour but you will not waste time and become frustrated.
Sea Farmer
Diamond
- Joined
- Mar 25, 2006
- Location
- Cape Cod, Massachusetts
If you die from this, can I have your car?
Lakeside53
Stainless
- Joined
- Sep 28, 2007
- Location
- Woodinville, WA
Yes.. are you sure it's 1750? What size disk does it have?
moonlight machine
Diamond
- Joined
- Nov 19, 2007
- Location
- marysville ohio
learn how to weld, you'l be doing a lot less grinding.
greenbuggy
Stainless
- Joined
- Oct 6, 2005
- Location
- Firestone, CO
Better yet, improve your weld game and your grinding game. I recommend a bigger grinder and Pferd disks, fastest ones I've found yet for hacking off large amounts of steel.
Perry Harrington
Titanium
- Joined
- Oct 7, 2006
- Location
- Klamath Falls, Oregon
Is this a big 20 inch disc sander?
You *can't* convert it from 1725 RPM to 3600 RPM, the speed is limited by the peripheral speed of the disc.
A better sanding disc would be the solution. 3M PSA 36 grit disc is the way to go. Get the blue/green ones for better life in metal.
You *can't* convert it from 1725 RPM to 3600 RPM, the speed is limited by the peripheral speed of the disc.
A better sanding disc would be the solution. 3M PSA 36 grit disc is the way to go. Get the blue/green ones for better life in metal.
[I have a 7 inch grinder that I use to clean up welding work.
One of my repeat jobs has an inside radius that will only fit a 3.5 inch wheel.
I have a bunch of 3.5 inch wheels that fit the grinder.
How can I keep the surface speed of the wheel up in order to optimise clean up rate (it's a production application) and wheel life?
Is there a way o double the grinder RPM? ]
How many ways does a guy need to ask a question in order to get a reasonable response?
One of my repeat jobs has an inside radius that will only fit a 3.5 inch wheel.
I have a bunch of 3.5 inch wheels that fit the grinder.
How can I keep the surface speed of the wheel up in order to optimise clean up rate (it's a production application) and wheel life?
Is there a way o double the grinder RPM? ]
How many ways does a guy need to ask a question in order to get a reasonable response?
WizardOfBoz
Diamond
- Joined
- Sep 30, 2006
- Location
- SE PA, Philly
Ah, the brevity and honesty of that statement are refreshing.
Buy a 3500 rpm grinder. Or (novel thought here) improve your welding skills.
Good luck.Lakeside53
Stainless
- Joined
- Sep 28, 2007
- Location
- Woodinville, WA
As you answered before... (assuming a universal motor) double the input voltage (not really practical for most) , or for your 3.5 inch wheel buy a 4 inch grinder.
Philabuster
Diamond
- Joined
- Jul 12, 2006
- Location
- Tempe, AZ
Hi, I have a large industrial angle sander with a rpm of 1750. Is it possible to convert easily to say 3500 rpm for grinding? Maybe be a clip here and a poke their....
Sounds more like an old paint buffer than a grinder.
metalmaster10
Stainless
- Joined
- Apr 18, 2012
- Location
- Indiana, USA
Even 3500 would be painfully slow... I can't imagine that being worthwhile.
My grinders range from...
old 9" Milwaukee that runs 5,000 rpm
Newer DeWalt 7" @ 8,500
New 4-1/2" from 10,000 to 11,500 depending on model....
All have the same 5/8" spindle.
Its about surface footage at the OD of the wheel just like turning on the lathe.
If it were me, and I only had a super slow sander / polisher, I would watch the sales over at big box and pick up a 4-1/2" for $50 and call it done. Wheels are cheap, available in every flavor imaginable, and everywhere.
I picked up a hitachi for $45 that im pleased with.
My .02
My grinders range from...
old 9" Milwaukee that runs 5,000 rpm
Newer DeWalt 7" @ 8,500
New 4-1/2" from 10,000 to 11,500 depending on model....
All have the same 5/8" spindle.
Its about surface footage at the OD of the wheel just like turning on the lathe.
If it were me, and I only had a super slow sander / polisher, I would watch the sales over at big box and pick up a 4-1/2" for $50 and call it done. Wheels are cheap, available in every flavor imaginable, and everywhere.
I picked up a hitachi for $45 that im pleased with.
My .02
gwilson
Diamond
- Joined
- Oct 1, 2006
- Location
- williamsburg va
Large dia. wheels might not be safe at double the speed. There are reasons why certain speeds are used. Get a small grinder. Curiously enough,I have heard many guys remark that they get great life out of a Harbor Freight small disc grinder,if you want to try a cheap one. I don't have one,but I'd recommend you to try one based on what I've heard.
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