Messages

2611

General Mach Discussion / Re: calibration problems need help please!

« on: March 24, 2006, 10:55:38 AM »

To use the calibrate method you need to have a block or tool shank of a known diameter, e.g. 1.000" dia end mill shank.

You can then use this as a setting block.

Clamp a block (any block NOT the known size one) to the machine axis, it must be set square.

Gently push the table up to it.

Zero out.

Move the table so that you can insert the known size block and push the table up to it so it is clamped by the table and the other block.

Don't move the table so hard it moves the clamped block.

Then calibrate.

This method should be better than a ruler.

Graham.

2612

General Mach Discussion / Re: calibration problems need help please!

« on: March 24, 2006, 10:38:09 AM »

are the pulleys toothed type or v belts?

if you count the number of teeth on each gear and on each pulley we can work out the ratios and set mach3.

if the pulleys are v belt type we need to know the exact diameter.  a rule measurement is not good enough.

Graham.

2613

General Mach Discussion / Re: calibration problems need help please!

« on: March 24, 2006, 02:35:04 AM »

how many decimal places are you measuring to?

The longer the axis movement the more accurate your measurement needs to be to allow for rounding errors.

What is the pitch of your leadscrew/ballscrew?

How many steps per rev of the motor.

What is the ratio of the motor to the screw?

With this you can work out what the steps per 1" should be.

With well adjusted equipment and good screws you could get the accuracy down to .001"

Graham.

2614

General Mach Discussion / Re: High helix end mill keep gouging

« on: March 23, 2006, 06:42:55 PM »

The only thing that can cause gouging is movement.

Something is loose or flexing.

Graham.

2615

General Mach Discussion / Re: High helix end mill keep gouging

« on: March 23, 2006, 05:19:16 PM »

Hi,

are you sure its the head moving?

It sounds more like its the backlash in the table when it changes direction.

Graham.

2616

General Mach Discussion / Re: Trying to learn/understand Feed Rate (F command)!

« on: March 23, 2006, 02:00:55 PM »

the 'F' command is global i.e. it could be put on the first line of the program and all following feed lines G01,G02,G03 ETC.  would work to this feed rate until another 'F' command it read.

so if you entered G01 X2. F.01 the X axis would move at this rate.  If the next line was Z-.25 this would feed at .01 too unless you told it to feed at a different rate.

G00 is a rapid move and as such takes no notice of the global feed rate.

I hope this helps

Graham

2617

General Mach Discussion / Re: Lathe turret toolchanger

« on: March 08, 2006, 03:31:17 PM »

Hi,

most turrets move forward to disengage the curvic coupling.  This is like two face gears that lock the turret from moving under cutting load.

Graham.

2618

G-Code, CAD, and CAM discussions / Re: tapping head cycle?

« on: March 08, 2006, 04:49:57 AM »

Not just a pretty face, sorry about the picture couldn't thing of owt else to put up there 

2619

G-Code, CAD, and CAM discussions / Re: tapping head cycle?

« on: March 07, 2006, 06:26:04 PM »

Hi JH,

try it like this

Graham

G20
G0 G17 G40 G49   G90
G61(CONSTANT CONTOUR OFF OR TURN ON W/G64)
(Clockwise tap operation)
M08
T7 M988 M6
G43 0
S+351 M03
G00 Z+.5000
X+4.0000 Y-2.0000
m98 p1000
G00 Z+.5000
X+4.5000 Y-2.0000
m98 p1000
G00 Z+.5000
X+5.0000 Y-2.0000
m98 p1000
G00 Z+.5000
X+5.5000 Y-2.0000
m98 p1000
G00 Z+.5000
X+6.0000 Y-2.0000
m98 p1000
G00 Z+.5000
X+6.5000 Y-2.0000
m98 p1000
G00 Z+.5000
M05
M30

O1000
G01 F14.60 Z-.5
G01 F29.2 Z1.00
G04 P2.0
G00
M99

2620

G-Code, CAD, and CAM discussions / Re: tapping head cycle?

« on: March 07, 2006, 03:25:28 PM »

Hi JH,

this is how I would do a rectangular pattern of holes. By changing the "L" numbers any number of rows can be done.

I hope this is what you want, no charge ;-)

Graham.


G20 G40 (standard setup lines)
S300 M3
M8
G00 G43 H3 Z1.00
G00 X0 Y0    (set position of first hole as X0 Y0)
M98 P1000 L19 (repeat 19 times)
M30

O1000
(this bit moves Y axis)
M98 P1001 L30 (repeat 30 times)
G91 (set to move incremental)
G00 Y-.5 (do move of .5 inch)
G90 X0 (set to absolute and go back to start of line)
M99

O1001
(this bit moves X axis)
M98 P1002 (tap hole)
G91 (set to incremental)
G00 X-.5 (do move of .5 inch)
G90 (back to absolute)
M99

O1002
(this bit taps hole)
G01 Z-.25 F14.625
Z1. F29.25 (remove this line to drill holes and change feed and depth)
M99