Re: FW: (ET) Electric Chipper/Shredder?

["" <thumphrey mynra com>]

I'm using an E-15 Motor to power my band-sawmill. It works, but is severly 
lacking in power. Well, not severely, but it needs power at speed not down 
low.


I currently have it geared to spin my band at about 4800fpm at top 
speed(no load).

The band needs to run at at least 4000 fpm to get an accurate cut, when I 
get into anything over 8 inches it really wants to slow down unless I 
reduce the feed rate to a snails pace. It took me about a minute and a 
half to rip a 2 x 10 17' long hemlock the other day. When the band slows 
down it will tend to either rise or dive into the wood, of course that is 
not good. 

I'm thinking about changing my motor pulley to a larger diameter to get a 
no load speed of around 7000, then I can bring it down to around 4-5k by 
feeding the stock a little faster.

To do that safely I think I need some sort of controller. Probably the 
best would be one that mimics a cruise control function and will adjust 
voltage/current to keep the motor at a set speed. Then I can put on a much 
larger
drive pulley and not have to worry about it overspeeding the band.

It has been challenging, finding a local supply of various sizes of 7/8" 
ID pulleys

Anyway, I think you may find the same issues with the chipper/shredder. 
They need power at a high RPM, keep that in mind. You will probably want 
to have a 1:2 gear in order to keep the motor into its torque band and 
still keep the chipper at a reasonable RPM. Then again....band-sawmills 
are normally run with 20hp and up ICE's not 5-12, so you might be OK. But 
you could possibly have a unit that rivals a 20HP ICE chipper.

As a couple points of reference.

My mill is powered from the E-Trak PTO, when the ammeter on my mill is 
reading 125amps, the tractor is right in the lowertomid yellow region on 
the E-Trak gauge. The mill idles at 25amps, this barely registers on the 
E-Trak. I'll try to get some digital shots of the two gauges working in 
unison this weekend. 

Stay Charged!
Hump
Rome, NY
I-5, Mower,Thrower,Chainsaw,Bandsaw,Blade.
 

> 
> 
> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu
> [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of Klein 
> Robert W
> NPRI
> Sent: Wednesday, September 15, 2004 8:33 AM
> To: 'Markus Lorch'; Klein Robert W NPRI; elec-trak cosmos phy tufts edu
> Subject: RE: (ET) Electric Chipper/Shredder?
> 
> 
> Instead of a contactor, I was going to use the existing belt tension 
> pulley
> engage mechanism.  It's right at the unit and tightens/loosens the drive
> belt between the motor and the chipper/shredder.  I would use the tractor
> PTO on/off switch to engage the motor and the tension lever to
> engage/disengage the unit.  Simple and lowtech.  Guess I'll have to take
> pics and post on the elec-trac site.
> 
> Bob
> 
> -----Original Message-----
> From: Markus Lorch [mailto:mlorch vt edu] 
> Sent: Wednesday, September 15, 2004 8:19 AM
> To: 'Klein Robert W NPRI'; elec-trak cosmos phy tufts edu
> Subject: RE: (ET) Electric Chipper/Shredder?
> 
> 
> Bob,
> 
> (assuming its the same motor as the E20 has)
> 
> I think that should work just fine. You would put the field in 
> parallel to the armature. I would keep the large klixon breaker to 
> interrupt
> power to the armature and field in case of an 
> overload. Maybe you would want to also hook up a large 
> contactor (like the PTO contactor) that could interrupt the power. It 
> would
> be triggered by an emergency stop switch mounted directly on the chipper 
> and
> by the motor internal temperature 
> switch (there are 4 small wires coming out of the motor,
> two are the field, the other two are the temp. safety switch)
> 
> Without this emergency-off button it may be too dangerous to 
> operate the chipper a few feet away from the tractor as you would be 
> unable
> to turn it off from where you operate/feed the chipper. Further more if 
> you
> have a heavy duty resistor 
> laying around the contactor could break the motor by directing induced
> armature current through the resistor. (you could also short the armature
> but I think that would chew up the contactor rather quickly). 
> 
> Markus
> 
> 
> 
> > -----Original Message-----
> > From: elec-trak-bounces cosmos phy tufts edu
> > [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of
> > Klein Robert W NPRI
> > Sent: Mittwoch, 15. September 2004 08:08
> > To: 'elec-trak cosmos phy tufts edu'
> > Subject: (ET) Electric Chipper/Shredder?
> > 
> > 
> > I recently picked up a ROTO HOE Mdl 500 chipper/shredder. Originally 
> > came with a 5hp to 12hp IC engine.  Thins one was engine less as it 
> > used the power takeoff pulley from the guys
> > tractor.   Anyway, I have a NOS E-20 drive motor sitting on 
> > my shelf and wanted to hear what everyone thought about
> > converting it to electric.  Is it as simple as some mounting 
> > bolts and the appropriately sized pulley?  Then I could just 
> > plug it into the mower deck/snowblower plug and go to town!
> > 
> > Bob Klein
> > Wheelhorse C-185
> > 
> > _______________________________________________
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> > Elec-trak cosmos phy tufts edu 
> > https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
> > 
> 
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