My new PowerPro HS only goes to ~8500rpm

mjsworkshop · Post by **mjsworkshop** » Tue Jan 11, 2011 9:20 pm

I just installed my new Power Pro headstock and I was giving it a run through the speed range without a load to make sure everything was okay.

Works great up to 8500rpms but won't go beyond that--even when selecting the 9500rpm present and starting on that setting.

I'll check the voltage at the outlet to make sure it's okay, but it seemed odd that it wouldn't go beyond ~8500. IS this normal for running with no load? Or should I be concerned?

Thanks- Mark J

charlese · Post by **charlese** » Tue Jan 11, 2011 9:48 pm

No! Not Normal!!! Call Shopsmith as soon as you can! 1-800-543-7586. They're open Mon thru Fri. 8am to 5pm, Eastern Time. Tell them your problem and ask for help!!!

mjsworkshop · Post by **mjsworkshop** » Tue Jan 11, 2011 9:51 pm

I was afraid that might be the case

Thanks- mj

nuhobby · Post by **nuhobby** » Wed Jan 12, 2011 5:39 am

FYI, when I did my DIY PowerPro retrofit, the key thing that seemed to influence the top-end speed capability was the belts & motor & pulleys alignment. A little bit of break-in time may assist things, too.

mjsworkshop · Post by **mjsworkshop** » Wed Jan 12, 2011 11:22 am

This particular PowerPro is Shopsmith built so the belt alignment should be good--but I'll check it.

Interesting development. I just ran through the speeds again and when I select 9500 and start it, it quickly comes up to 8500 and then takes about 15 seconds to come up the last 1000rpms to 9500.

I may have shut it down too early in my last test thinking that something might be wrong and not wanting to run the motor at such high speed if something was wrong.

So the motor does make it to 9500rpm but it comes up to 8500 and then takes about 15 seconds to go from 8500 to 9500. Is that your experience?

Thanks- Mark

dickg1 · Post by **dickg1** » Wed Jan 12, 2011 1:53 pm

mjsworkshop wrote:
So the motor does make it to 9500rpm but it comes up to 8500 and then takes about 15 seconds to go from 8500 to 9500. Is that your experience?

Thanks- Mark

That is not how mine works. I ramp it to 10,000 and it goes there.

Dick

wa2crk · Post by **wa2crk** » Wed Jan 12, 2011 5:23 pm

MJ;
I also have a factory assembled Power Pro and I just tried mine and when preset to 9500 and turned on it goes right to 9500. If the programmed speed reads 9500 on the display but the running speed reads less and then comes up to the pre-programmed speed after a few seconds I would suspect a possible problem with the optical reader which counts the revolutions of the shaft. Can you determine if the spindle actually does run faster as the displayed speed rises or does the shaft speed remain the same while the counter catches up? You probably won't be able to tell unless you have a tachometer to watch the shaft RPM.
Bill V

JPG · Post by **JPG** » Wed Jan 12, 2011 5:44 pm

[quote="wa2crk"]MJ]

Anybody know if it has an optical 'speed sensor' or a hall effect(magnetic) one?

wa2crk · Post by **wa2crk** » Thu Jan 13, 2011 9:49 am

JPG;
Not sure but I thought that I read optical in some literature someplace. The motor has to run at a different speed than the shafts so I am assuming that if the sensor is in the motor then some calculation has to be done in the electronics to display shaft speed. I don't know what the ratios are between the motor pully and the auxiliary shafts although the ratio between the upper aux shaft and the lower one would have to be the same as the old system to retain the 60% increase at the lower (jointer) shaft. I AM NOT GOING TO TEAR DOWN MY FACTORY PP HEADSTOCK TO FIND OUT)
It works too good. Just my gut feelings, what say you?
Bill V

charlese · Post by **charlese** » Thu Jan 13, 2011 2:11 pm

JPG40504 wrote:Anybody know if it has an optical 'speed sensor' or a hall effect(magnetic) one?

Somewhere in the PowerPro manual it mentions the laser light. !!!CORRECTION: Infrared light not laser ight.!!!

All issues like slow speed and slow gaining speed need to be addressed by Shopsmith! Believe Me!

Shopsmith Forums

My new PowerPro HS only goes to ~8500rpm

My new PowerPro HS only goes to ~8500rpm

The solution lies in a call to Shopsmith