Porting With an Electric Die Grinder

[RevTheory]

Gentlemen, can you help me slow down my piece-of-shit, Chicago Electric grinder? I bought a cheapo controller and all it did was slow it down from fuggin' nuts speed to too-fast-to-port speed.

Is there a certain specification I should look for in the product description? I'd like to kill this grinder before buying a really good one.

[1980RS]

Gentlemen, can you help me slow down my piece-of-shit, Chicago Electric grinder? I bought a cheapo controller and all it did was slow it down from fuggin' nuts speed to too-fast-to-port speed.

Is there a certain specification I should look for in the product description? I'd like to kill this grinder before buying a really good one.

The word is, you can't. I have tried to slow down the high speed grinders like that with a controller and all they do is bog down at low speeds. I bought a low speed high torque die grinder off of Amazon that did have it's own variable speed but when that failed I used the controller and it did work great with that die grinder and one other I have like it.

[FC-Pilot]

Gentlemen, can you help me slow down my piece-of-shit, Chicago Electric grinder? I bought a cheapo controller and all it did was slow it down from fuggin' nuts speed to too-fast-to-port speed.

Is there a certain specification I should look for in the product description? I'd like to kill this grinder before buying a really good one.

I used a foot controller like you would see from a sewing machine. I will never port without it. Easy to get to stop and I can constantly control speed to match the amount of force I am putting on it.

Paul

[HDBD]

A shaft drive by Foredom sure works well and they offer great parts support. Mine is OLD and I keep it running just fine.

[travis]

Gentlemen, can you help me slow down my piece-of-shit, Chicago Electric grinder? I bought a cheapo controller and all it did was slow it down from fuggin' nuts speed to too-fast-to-port speed.

Is there a certain specification I should look for in the product description? I'd like to kill this grinder before buying a really good one.

That's probably the same grinder I have. 1 controller doesn't slow it down near enough... especially for a 6" long burr. 2 controllers slow it down but then it has no power at all and bogs down way too easily.

Last time I looked there was still no Foredoms available

[Joe-71]

Slow down your high speed electric grinders with a router speed control box from Harbor Freight. Works just fine, and mine has been used almost daily for a couple of years without issue, especially with coarse cartridge rolls that need speed control. Will work with a shorter shank(3-4" carbide, also) I cut a 6" shank carbide for special areas where I can use a 90* air die grinder. Joe-71

[RevTheory]

Slow down your high speed electric grinders with a router speed control box from Harbor Freight. Works just fine, and mine has been used almost daily for a couple of years without issue, especially with coarse cartridge rolls that need speed control. Will work with a shorter shank(3-4" carbide, also) I cut a 6" shank carbide for special areas where I can use a 90* air die grinder. Joe-71

This is the one I've got and it's still too damn fast. https://www.woodline.com/products/route ... TfEALw_wcB

[maxracesoftware]

Slow down your high speed electric grinders with a router speed control box from Harbor Freight. Works just fine, and mine has been used almost daily for a couple of years without issue, especially with coarse cartridge rolls that need speed control. Will work with a shorter shank(3-4" carbide, also) I cut a 6" shank carbide for special areas where I can use a 90* air die grinder. Joe-71

This is the one I've got and it's still too damn fast. https://www.woodline.com/products/route ... TfEALw_wcB

your's looks like the 2 new ones i have . (Goodson and Lowes units)

the best one i have ( 3rd one ) is an old WW Grainger (Lutron 10 AMP constant Torque control) in my Porting Room ,
it will go much lower RPM than your's and my 2 new ones ,
and still have constant Torque ..... i wish they still made that one ... if i ever find one like it for Sale , i'll instantly buy it

[RevTheory]

I had to dig deep but if I'm not mistaken, this is the one used in Vizard's porting benches. I believe it was wired to the outlet that our grinders were plugged into. Am I out to lunch? Whatever it was, it would slow this grinder down to where it would simply buzz without rotating.

https://www.amazon.com/dp/B079BB7VK5/?c ... dp_it&th=1

[6.50camaro]

What you want is rheostat, like a ceiling fan speed control not a dimmer switch type control. A rheostat controls the hertz frequency a dimmer Switch controls the voltage . When you drops the voltage the amps go up because you are not changing the wattage of the motor. this can overheat the cord and or windings burning thing out. Changing the frequency slows the alternating current speed and slows the motor down without the added heat. Home improvement store should have them , they are rated by wattage of what its controlling. they usually have a big aluminum heat sink on them with a dial or slide to adjust speed . I Have the same problem with my Harbor Freight rotor control just haven't got around to installing one in the new garage since moving .Dan

[Joe-71]

The question was asked, and answered. Works for me with a Dewalt high speed die grinder just fine. I can slow it down to the point the grinder will stop with any pressure, and still speed up if I move the control knob to a higher setting. The Dremel foot controller quit within a week. For the price, you can't beat the Harbor Freight I have 4 Dewalts loaded, with another dozen air grinders ready to save time. Joe-71

[digger]

how much guts does the 1/6hp Foredom have compared to a Mak ? it seems like fairly low on power level how does it work in practice on Al?

[WeingartnerRacing]

how much guts does the 1/6hp Foredom have compared to a Mak ? it seems like fairly low on power level how does it work in practice on Al?

All I use is the foredom. Does great for me just get the square drive otherwise will keep wearing off the tips on the key drive.

[pcnsd]

I had to dig deep but if I'm not mistaken, this is the one used in Vizard's porting benches. I believe it was wired to the outlet that our grinders were plugged into. Am I out to lunch? Whatever it was, it would slow this grinder down to where it would simply buzz without rotating.

https://www.amazon.com/dp/B079BB7VK5/?c ... dp_it&th=1

This looks to be an AC phase angle control package mated to a SSR. It should provide line full voltage (and torque) at all settings but cuts the sine wave % to control speed. Connected to an appropriate foot controlled variable resistor would be a good choice for port work.
Search for "AC phase angle motor control" for a greater understanding. It is common in industry for AC motor control.

[racear2865]

Do these count as electric and as shown has several 6 inch in now

reed2.jpg