the great thing is that there are metal cutting cermet blades available now that are rated to 4000 rpm. from 7 inch to 14 inch. It just takes a little digging online.

If you had a microcontroller you could attach an encoder assembly to the motor shaft and control the field winding so you can compensate for load, so when you are actually sawing, you can program the thing to give it more power. That means more consistent speed.

I have been thinking about doing this very thing. But got discouraged after being told dropping the speed would drop the torque. I am going to be heading down the gear reduction path. I would love it if some kind of cheap controller would work.

Those router speed controls are just a light dimmer. They don't regulate voltage or speed just chop the AC signal.

So did you get this working in the end? Want to buy a cold cut and have a makita abrasive. Seems logical to be able to use both on the same machine

Interesting. Going to have to get one of those for different things.

Hey buddy ! You actually already have the best speed controller for that unit . You have a vfd ! Plug into it and scale the speed back . The vfd will match the hz wave with the voltage and then you'll have no issue with increased resistance and taking a chance on harming the motor windings . The clipped wave you are talking about works fine if it clips at the end of the wave. Anywhere else and you will end up with the same issue you'd have if you ran resistors .

@mustie1

8 жыл бұрын

+Bagot Corner l agree but this is not for me, he could buy one of those too

@BAGOTCORNER

8 жыл бұрын

+AvE vfd certainly does do single phase in to single out . Invertek here in Canada sells them ,and they also sell them in the states in either nema setup .

@Nolanyoyo

8 жыл бұрын

+AvE lol no way you're here to lol. Remember your copper workbench for electronics you built. I did the same thing cus of that and ended up ripping it up after getting zapped about 4 times. And annoying to try not to keep the back of circuit boards from shorting out.

@BAGOTCORNER

8 жыл бұрын

+AvE were you saying something ? Don't let it bother you that something exists that you didn't think possible . They said the same thing about the world being round .

@BAGOTCORNER

8 жыл бұрын

+AvE I run my lathe off one. Single to single . Cheaper though in hindsight would have been to buy a 3 phase Motor and purchase a more useful vfd

Nice job getting the chop saw to run on ac& dc power.

seriously though, I know his chop saw runs at 4 grand but honestly, if it's me, I just friggen run the thing in the chop saw and saw the heck with it! Of course I also might wear welding leathers and a face shield when I ran it, but still.

All motors with brushes will run on Alternating current (AC), or Direct Current (DC). But, a VFD might be the trick to variable Chop Saw speed. You did right to do some speed tests with the voltage limiter, but, power is down, when current is limited. Got my 2 HP VFD on ebay, for $105.00.

I have never had good results with any of these kinds of speed reducers. You always lose power because the motor is designed to work at a certain rpm for maximum efficiency and cutting the input voltage or amperage (either way) only starves the motor for power and as a result efficiency. I have used sewing machine pedals in an effort to do the same thing, but always end up with insufficient power to do the job properly.

@glenndavis2762

8 жыл бұрын

Well there you have it - He simply needs to replace the chop saw motor with a sewing machine unit. - hahahahahaha thanks

AvE (Chris) said you slowed it down and made a cold-cut slicer out of that chopsaw. :-p I came to see it but...... Still a cool vid man.

@WCPAGEL

5 жыл бұрын

Me too lol

It seemed to do fine, it served it's purpose right and cut?

Very thorough Mr Mustie.

Harbor Freight sells them for $20. I use one on my 4 in. grinder, but you do lose some power.

@keronrussell7700

22 күн бұрын

Wats the name of it

cool of you to do that for schuu

You're gonna lose power no matter how ya reduce it.. Reducing power in, reduces power out.. No way around it... Either way, AC motors, don't like that.. it will heat up.. You need a frequency drive to do it right, and they cost more than the saw.

These motors aren't designed to be throttled. With a steel instead of abrasive blade the loss of torque would make it cut worse than just using it as designed with an abrasive. Those controllers are fine for light torque stuff, but a heavy gear reduction on a cheap universal motor needs full power to do real work.

@wildeyednorthernboy

8 жыл бұрын

+tiporari cutting with abrasive blade SUCKS,,,its way slow...musti1 is doing this video to help me i have a dewalt 14" chop saw with abrasive blade ...it took 10 mins to cut a piece of metal 3/8 " thick x 1" wide i am NOT try to fight about this ..just trying to find a way to use the saw i have & a metal blade to cut metal

@tiporari

8 жыл бұрын

+wildeyednorthernboy Didn't mean any offence. I've used the speed controllers before, and it has just been my experience that these saws only have enough power to do the job when run at full speed. they are built down to a cost, and have no "oomph" to spare. Good luck with it. try the $15 harbor freight speed control and see if it works for you. I have one and its fine for grinders and wire brushing. might be fine for your purpose too.

@wildeyednorthernboy

8 жыл бұрын

do u think i would b wasting my tyme with a speed controler on my chop saw...i REALLY dont know sir thank u 4 your tyme

@tiporari

8 жыл бұрын

+wildeyednorthernboy Yes sir, I do. these brushed motors don't slow down without losing all their power. Those metal cutting blades would just bog down the saw if it were throttled. If you run them too fast they will chip teeth and mangle the operator. I would get a metal cutting bandsaw. A portaband on a stand makes quick work of cast and steel. The cold cut saws are nice, but expensive to run, expensive blades, and easy to bugger.

@tiporari

8 жыл бұрын

+wildeyednorthernboy You know something occurred to me, and I've experienced this before. Some abrasive cut off wheels really suck. I've also seen them get impacted with aluminum or other soft metal and stop cutting altogether. 10 minutes is way too long. have you tried a different wheel? maybe a different brand/grit? I have bought Dewalt ones from Home Depot that weren't worth pounded sh!t.

A 15 or 20 light dimmer connected to a plug put in a electric box will do the same thing!

@Nolanyoyo

8 жыл бұрын

+Nails you wont get more then a amp out of those

@allmihi

8 жыл бұрын

15 or 20 (amp)

@yourbeekeeper

8 жыл бұрын

+Nails Light dimmers are rated by watts. A typical light dimmer is 600watt. To calculate amperage you divide the wattage rating by the voltage from your power source. In this case 600/120 = 5amp...that is the absolute max and would heat up those cooling fins quickly. I suspect that saw, under load is easily 12-13 amps.

@wildeyednorthernboy

8 жыл бұрын

+yourbeekeeper saw not under load is 15 amps