Messages

4101

General Mach Discussion / Re: BT30 spindle from scratch - with power drawbar and ATC of course

« on: July 29, 2012, 11:02:59 AM »

HEY guys go for it. Just a note the referenced spring is a triple set of springs not a single stack.

When you implied using a auto retainer setup I assumed you meant using the keepers as well.

When you do a static rotational grip test it is NOT the same as a running ,cutting spindle. The vibration and side force of cutting effect the holding power of the taper.

You can spend a lifetime inventing new ways to do old things with little improved outcome of the results OR a life time making new parts and gizmos. I am with the patent people 99.9% of everything important has already been invented.

Sling some chips, (;-) TP

4102

General Mach Discussion / Re: BT30 spindle from scratch - with power drawbar and ATC of course

« on: July 28, 2012, 09:13:18 PM »

MIGHT work, But the closer to coil bind you take the spring the more unreliable it gets. I also build race engines. I would definatly suggest a screw down threaded adjuster as you WILL have to readjust the height over time to keep the pressures correct.

Compressing the dual spring packs up to 1000 lbs to install can be a scary deal even with a air/hydraulic spring compressor design to do it safely.

Would not be my first choice but could work.

Bevel spring packs are used around the world every day for CNC machines why reinvent the wheel?  WITH your number of tool changes I don't think spring changeouts will be a concern. The choice of spring is that for a reason. Might want to ask a manf WHY they use it.

(;-) TP

4103

General Mach Discussion / Re: BT30 spindle from scratch - with power drawbar and ATC of course

« on: July 28, 2012, 10:20:39 AM »

One too many zeros I am afraid. Ray has it covered on spring stacks. To get  pressure AND needed travel it takes a STACK of bevels to get it all done.

(;-) TP

4104

General Mach Discussion / Re: Input 1.

« on: July 27, 2012, 11:52:48 PM »

I think the original intent was IF the safeties were not armed THEN the machine would NOT run the G code program. That part still is there. I think the back end got added on as an after thought. If you open the door the machine stops with Estop.

Probably the best option as you cannot really depend on feedhold to always stop quickly. So you cannot stop the spindle UNTIL motion stops. So there is a period of unsafe condition after opening the door.  I think running with the buffer you have little choice but to either run the buffer out OR dump the buffer and stop instantly.

AND you have to remember Mach3's  hobbist background. I don't think it was a top priority at the time.

Just a thought, (;-) TP

4105

General Mach Discussion / Re: Input 1.

« on: July 27, 2012, 08:47:12 PM »

You could be right, the longer it is not having an active machine here at the house that runs MACH3 the more I seem to  forget about how it is suppose to work(;-)

Probably about time to sit back and watch the newbies play with it .

(;-) TP

4106

General Mach Discussion / Re: Input 1.

« on: July 27, 2012, 08:17:18 PM »

HOOD I cannot make out the vid very well I will test the machine back at the shop on Monday.

Testing here at the house i set the velocity wide open and the acell all the way down and watched the dro decay as it sped up and slowed down. The STOP came to an instant stop.

IF the input#1 does not use the accel/deaccel it is useless for a safety. Might as well just Estop it.  

From the safety aspect then MACH3 cannot be made to be safe as you must stop the machine including the spindle which CAN be done BUT at the loss of position and restarting is NOT one of mach3 strong points. Machine with large look ahead tends to run on a bit before stopping with feedhold.

Just a thought, (;-) TP

(;-) TP

4107

General Mach Discussion / Re: Input 1.

« on: July 27, 2012, 07:39:23 PM »

Testing here it seems to work ok using the input#1 function. Stops with deaccel. while Stop stops instantly
Could be wrong though, (;-) TP

4108

G-Code, CAD, and CAM discussions / Re: G code strategy

« on: July 27, 2012, 07:11:07 PM »

YEP just run the dispense function in INC mode.

(;-) TP

4109

General Mach Discussion / Re: Input 1.

« on: July 27, 2012, 06:08:27 PM »

I thought that the input 1 just blocked the execution of the Gcode program to keep it from running?

(;-) TP

4110

G-Code, CAD, and CAM discussions / Re: Drag Knife

« on: July 27, 2012, 02:51:47 PM »

I think you are referring top a tangent Knife function not a drag knife. The drag knife is free floating for rotation. The tangent is axis controlled and follows the direction of XY movement.

Just a thought, (;-) TP