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### Messages - BR549

4691
##### G-Code, CAD, and CAM discussions / Re: Tube coping subroutien wont repeat properly
« on: December 25, 2011, 11:17:55 AM »
WOW you were really close right out of the box. BUT the Sub formula is based on XY=0.000 (;-).

The best way would be to shift the X coord base to account for the length of the tube.

(CNC A axis Plasma TUBE Coping routine)
(Math derivative by Dan Hopper Copyright 2006)
#100= 1.250       (CutTube Diameter)
#101= 1.250       (Uncut Tube Diameter)
#103= .095         ( Tube Thickness )
#104= 45             (Joint ANGLE)
#200 = [#100 / 2]         (RO)
#201 = [#101 / 2]         (RU)
#202 = [#200 - #103]  (RI)
#203 = #104                (AF)
#204 = 0                       (ID)
#300= 2                        (A step in deg)
G0 G40 G54 G90 G49 G17 G50 G64 G91.1 G94
G0 A0.000 x0.000 Z1.000 F500
Z0.000
M98 P01 L180

#104= -45             (Joint ANGLE)
#200 = [#100 / 2]         (RO)
#201 = [#101 / 2]         (RU)
#202 = [#200 - #103]  (RI)
#203 = #104                (AF)
#204 = 0                       (ID)
#300= 2                        (A step in deg)

G0 A0.000 x5.000 Z1.000 F500   (you shifted the Tube length here)
G92 X0.000                               (NOW reset the X coord to zero)

Z0.000
M98 P01 L180

G0  A0.000 X0.000 Z1.000
M30
o01
G1  A#300 X  [sqrt [#201 **2 - [ [#202 * sin [#204]] **2]] /  sin[#203] -  tan [90-#203] * #202 * cos[#204]]
#204=[#204+2]
#300=[#300+2]
m99
%

Give that a try, (;-) TP

4692
##### General Mach Discussion / Re: Milling letters/design on arched face surface
« on: December 22, 2011, 05:08:09 PM »
AH you are doing domed engraving that is a different cat. Take the Dxf file from Deskengrave then apply it to a 3d dome surface and then ortho rectify it for the dome.

Easy to say not so easy to do.

(;-) TP

4693
##### General Mach Discussion / Re: Milling letters/design on arched face surface
« on: December 22, 2011, 04:05:07 PM »
DeskEngrave (;-) and its free.

(;-) TP

4694
##### Modbus / Re: multiple serial modbus slaves
« on: December 21, 2011, 10:36:01 AM »
HOT Dog, Yous guys are speaking what I want to hear.

(;-) TP

4695
##### General Mach Discussion / Re: Mach3 screen in relation to the table?
« on: December 21, 2011, 10:01:54 AM »
Most machines I use have the Machine Zero(Refhome) to the top(away) and left. Now Point of origin or work Zero will be left bottom on the table or where ever you set it.

Just a thought, (;-) TP

4696
##### General Mach Discussion / Re: Missing steps! Upgraded my screw drive to R&P
« on: December 20, 2011, 07:11:51 PM »
For a 5x10 table I would consider Nema 34s as a better solution.

Just a thought, (;-) TP

4697
##### General Mach Discussion / Re: gcode for "home"
« on: December 19, 2011, 08:52:11 AM »
WHich HOME do you want.

There is G28 that sends the machine to what is defined in config  OR

There is G30 which sends it to the true home position as defined by the home switches OR

There is G0X0Y0 which sends it to the Point of origin (HOME) of the work corrds.

(;-) TP

4698
##### General Mach Discussion / Re: Missing steps! Upgraded my screw drive to R&P
« on: December 18, 2011, 09:56:42 PM »
Make sure you check the max rating of the drives.

(;-) TP

4699
##### General Mach Discussion / Re: Missing steps! Upgraded my screw drive to R&P
« on: December 18, 2011, 05:05:08 PM »
BUt yourare geared much different(requiring more torque) AND I bet the gantry is much heavier leaving more inertial weight to deal with(requiring more torque) also with the higher gearing your resolution per step has changed to the worse.

If you can change the gearing to about 5-6:1 instead of 3. That will give more torque BUT it also slows down max velocity.

My guess is you are loosing mini steps at each change of direction. Try setting the Accel to 1 but then you face the delima of slow accelleration and CV rounding. So you may have to run exact stop mode.

Just some thoughts, (;-) TP

4700
##### General Mach Discussion / Re: Missing steps! Upgraded my screw drive to R&P
« on: December 17, 2011, 06:45:17 PM »
Well you went from 8000 to 1388 so that means the R&P is geared a lot higher (faster) and it will require a lot more torque to drive it at the same acceleration rate as you had  and to help keep it from loosing steps. You are already down very low on acceleration vs velocity

It will depend on how much reserve torque you have to work with from the original design criteria.