Topic: Drill Press 4:1 and 2:1 kits

[FourbangerYJ]

http://www.pirate4x4.com/forum/tools-supplies/1090551-rogue-drill-press-reduction-kit-1-2-1-4-ratios-available.html

This is pretty cool. I don't do a lot of large holes with my drill press but having it be able to slow the RPM's down would be awesome!

[neale_rs]

That is cool.  I've ruined a lot of drill bits due to the speed.

[oldjeep]

I just put a vfd on mine - one size fits all and you get infinite adjustability

[sharpxmen]

a vfd is def cool - don't you need a 3 phase motor for those though?

[oldjeep]

a vfd is def cool - don't you need a 3 phase motor for those though?

Mine is a three phase, but there are VFD's for single phase motors as well.

Here is one:
http://www.anaconsystems.com/text/opti_e2.html

This is the one I run:
http://www.motortronics.com/pages/acdrives_ME2a.html

[sharpxmen]

i was looking at a vfd for my lathe, didn't know there were single phase available although they are pricey ('bout double compared to 3 phase from that link you posted) but it saves you from getting a motor.

[oldjeep]

i was looking at a vfd for my lathe, didn't know there were single phase available although they are pricey ('bout double compared to 3 phase from that link you posted) but it saves you from getting a motor.

There are probabally cheaper ones available - just happened to be the first one that popped up in a search.

[neale_rs]

It seems the 4:1 and 2:1 kits would slow it down and increase the torque.  Does the VFD decrease the torque along with the speed?  If it does, could this be a problem in some cases?

[sharpxmen]

i think the torque is constant with a 3 phase vfd (dunno about the 2 phase). It varies the frequency and the voltage remains the same.

[neale_rs]

Constant instead of increasing.  So it doesn't decrease but would still be less than with a gearing (or pulleys) setup.  Don't know if it would ever cause a problem...not enough torque for some application.

[oldjeep]

I know I can stop mine with my hand if I feel like it, but torque isn't really something you should need in a bench drill.  Mine is a bit odd, as it is an old high speed 40's press out of a war factory with 2 speeds in the pulleys, a 2 speed gearbox and a 2 speed motor (the 2 speeds on the motor are disabled by the VFD).  I can get the thing down to around 100RPM


8 Speed Avey Drill Press, size number 1/2 Heavy made by Avey Drilling Machine Corp. of Cincinnati Ohio. The unit has a set of high and low speed selector push buttons and a high / low speed lever providing 8 speeds are (4500/1200, 600/1600, 9000/2400, 12000/3200 rpm). The machine is 73" tall by 21" wide by 36" deep.
 
Unit has a brass plate on back that reads "Defense Plant Corp. an Instructmentality of the United Sates Government."

[neale_rs]

From the 40s!  Pretty interesting machine.