Re: speed of screws

Hello,

Sounds like you have had some fun, and learned some things...

Yes, if you reduce your steps per inch, you will go faster. How about
making a new leadscrew and nut from 1/2-13 threaded rod? (Hi Bob<G>)
This will take you to about 3466 SPI (Steps Per Inch), which should
let you go nearly twice as fast.

Ask Dave R at hobby CNC what type of drive you have. Also its
voltage. Many low-cost systems are unipolar drives operating at 12
volts. I have posted on this list and the maxnc list how to speed
these up.

In short, there are a few steps you can take without NEEDing motors,
encoders, and geckos, but it sounds like you've been bit... Start
saving, and treat the wife well :-)

Hope this helps.

Ballendo

P.S. 6400 sPI for a 24tpi rod seems strange. You sure it's not 16 or
32 tpi? Both 3/6-16 and 10-32 are standard threaded rod sizes. 10-24
is also, but 6400 divided by 24=266.66 steps per rev of the motor
(assumes direct drive, which is what the hobbyCNC plan looks like to
me- from inet pics only)

--- In CAD_CAM_EDM_DRO@y..., "jumpnkd" <jumpnkd@a...> wrote:
> Two years ago I had never heard of CNC then I saw a patern that was
> cut in to a peice of wood. Being a woodworker I said if it will do
> that Imagine what I could make it do!
> I bought a 60oz stepper kit from HobbyCNC and got set of plans for
a
> small router table. I started out making the table and went to buy
> leadscrews and stopped building because of cost of screws. well I
> started up once more after buying a leadscrew from one of the
Surplus
> places. Then I made one from threaded rod 24tpi. It works great has
> taught me more that my wife cares to talk about. But I only can get
> 10"per min feed rate. Now is this because I am stepping 6400 times
to
> get a Inch or have I reached the torque limit of the stepper. or a
> little of both. I want to take what I have learned and make a
larger
> router table and faster, and maybe speed up the first one I built.
> Or do I need to start playing with motors with encoders and Geco
> drives?