View Full Version : Probing / Digitizing - What the best way to do this job?

Mad Professor
07-05-2011, 03:23 PM
Good day all.

Some time ago I asking about Digitizing (http://www.mycncuk.com/forums/showthread.php/3009-Digitizing).

For one of my current project I need to know the bolt hole patten of a gearbox bell housing, so that I can design and make a suitable adaptor plate.

Here is a picture of the gearbox bell housing in quesion.

Sorry about the quick MS Paint drawing :redface:.

Does anyone have any Probing / Digitizing scripts that will do this job, or does anyone know how to make Probing / Digitizing scripts?

Or is there a better way of doing this?

Thanks for your time.

Best Regards.

07-05-2011, 06:07 PM
If it's just the bolt holes you're after then I would just measure between them with a calliper and add the radius of each hole to get the centre distance. Should be plenty near enough for this.

Could you use the existing one as a template, drill through it and put a bolt through each hole after drilling to stop it wandering.

08-05-2011, 12:32 PM
but if you DO want to have a go via probing there are numerous ways you can do it. A simple way (not the most optimized) is to jog your probe down into the hole roughly in the centre (but doesn't really matter). Probe west, note the X returned - NOT the current position displayed. (in Mach for example the X trip point will be in gcode var 2000 your controller/interpreter may differ). Now probe east, note the X position. G0 or G1 mid way between your recorded points. Now probe north and south and note the Y trip points (in Mach gcode var 2001) then move to the mid point of your recorded Y trips. Voila - your at the centre - or at least as accurately as your probe allows and your holes are circular. The probe command in Mach is G31.