David, Don t make your decision based on those terrible sound clips. They sound like movies made with a cell phone camera. The audio is atrocious. I made myMessage 1 of 10 , Feb 28, 2007View SourceDavid,
Don't make your decision based on those terrible sound clips. They
sound like movies made with a cell phone camera. The audio is
I made my own belt drive and the effort is worth it for the noise
reduction, alone. Believe me, the noise reduction is SIGNIFICANT!!!
I own a decibel meter and I should have used it before and after to
document the noise levels.
But here's an experiment you can do on your mill. Run your mill with
the gears and note the sound level. Then unbolt the motor. Now run
the motor resting on the top on the mill with no gears engaged. All
you hear is the motor. That's pretty close to what a belt drive
sounds like. The faster the spindle turns the greater the noise
I would go out on a limb to say all belt drives are about the same
for noise reduction.
The main reason I changed to belt drive was to eliminate the broken
gear problem. Maybe you've never broken a gear, but I push my little
mill pretty hard. I never worry about breaking gears with a belt
drive any more . That's because there are none.
--- In GrizHFMinimill@yahoogroups.com, David Patterson <odd_kins@...>
>good one but my gear drive sounds more like the belt drive.
> I glad you posted the sound clips, I don't know if i just got a
Hi. I ve been lurking here for a month or two. With that Harrison conversion, the low range goes from 0 to 2250. If I remember right, the conversion LMS sellsMessage 2 of 10 , Mar 1, 2007View SourceHi. I've been lurking here for a month or two.
With that Harrison conversion, the low range goes from 0 to 2250. If
I remember right, the conversion LMS sells is 0 to 1700 in low, and
the stock gear drive is 0 to 1100 in low.
You can't get speed without losing torque. The machine has torque to
spare for most milling operations, but I run a 3/4" drill in mine
with the stock gear drive -- very carefully -- and the torque now is
very marginal. I put a reversing switch on mine for power tapping
(half the fun of having a mill) and now it will run a 3/8"-16 tap in
aluminum, but only a 5/16"-18 tap in steel.
I'd LOVE to have a belt conversion, but I'm not willing to give up
much torque so I'm sticking to gears for now. Maybe someday I'll make
my own conversion with a huge spindle pulley, aiming for 0 to 1200
rpm. The torque loss that would be inevitable with the Harrison
conversion makes it out of the question for me.
I'm new to the mini-mill, but I am a professional machinist. I need
speeds over 2000 rpm like I need a hole in the head, in a manual
machine. Give me the torque, thank you!