Lead screws and the z-table

[jarbon]

I have a 3"x4" working area on the table I'm putting together, and I need some advice about lead screw sizes and threading, and the sources for them.

Any help would be greatly appreciated!

John

[jarbon]

No one has done this?

John

[waltfl]

I did it but I can tell you if you got the regular K40 size you are better and cheaper if you buy the one from marco.
my lead screws with bearing was already $ 120. then I needed the stepper motor and all the little parts overall it was more then $ 180
greetings
waltfl

No one has done this?

John

[jarbon]

I ended up purchasing the 24" lead screws, nuts, bearing blocks, stepper motor mount, and coupler from http://www.precisiontechmachining.com/ for a total of $225.00
The honeycomb panels for the 3'x4' work area were $65.00 * 2 + $80.00 in shipping from lightObject (here).
I'm using 8020 extruded aluminum t-bars for the supporting structure that also support the cnc cutter itself.

I'm guessing that I'll be needing an aluminum plate for the table base, on which I'll be mounting the honeycomb panels, lead screw nuts, etc. maybe 1/4" thick?

I'll start a new thread documenting the project, as well as the cost of parts as it comes together.

John

[jarbon]

I received 2 600x900 honeycomb sheets for my z table, but I'm concerned about the weight of the sheets, let alone the added weight of the metal plate under them, and the brackets to connect the table to the lead screws.

The lead screws I got are 12 tpi, and stepper motor I have is a Nema 23. These all would be driven by the one motor all connected with a #25 roller chain.

I figure that one honeycomb bed weighs about 18 lbs each. So, 36 lbs + metal bed plate and brackets. I this too much for the one motor? Or should I get a bigger one?

John

[Tech_Marco]

For such big power Z table, a regular Nema23 (57 series) motor is not goind to work. Plus, you got to have 2:1 reduction gear
See picture I attached on our machine. Note the small motor size when compare to a Iphone. It is used on a 600x900 machine. It is "86" series motor with 7.8A current if I'm not forgotten. That I conclude that by using a Nema23 motor, your system (without 2:1 gear) may not be able to move at all .


Marco

[Tech_Marco]

Update: I have 3 power Z table samples (in different size) coming from an ocen shipment scheduled to dleivery on Nov 23. The Z table is very heavy I guess it is over 100lb with stainless steel frame. It is a monster to use!

[jarbon]

Marco, do you have a source for this motor you are recommending?