wacky threading with emc2 :)

[samco]

EMC2 can do some pretty interesting stuff with spindle synced motion...

http://jmkasunich.com/cgi-bin/blosxom

YouTube - Variable Diameter/Variable Pitch ThreadCutting with EMC2

YouTube - Variable Diameter/Variable Pitch ThreadCutting with EMC2

[SpeedsCustom]

Whats it for lol?


-Jason

[cadmonkey]

I agree - pretty cool - but what is it?

[Seb]

It's part of the drive-train of a mouse-trap-powered robot. The picture shows the starting configuration, with the spring of the mouse trap stressed. When the mouse-trap is triggered, the spring will work, pulling on the string, causing the wheel axle to turn.

As you can see the spool starts out in "low gear" (low speed, high torque) when the robot is just starting to move, and later it moves into higher and higher "gears" as the robot picks up speed.

There is some more details on JMK's blog, linked in the original post.

JMK is a master.

[cadmonkey]

Thanks - I didn't notice the link in the post - duh.

[Ryobiguy]

Super cool! I immediately figured out once I saw the wheel and string that it is a spring powered, multi-geared machine.

How do you get EMC to do this? Excuse my ignorance, but are there g-codes to get the tapered threads like this?

[samco]

You just string a bunch of g33 moves togather. (spindle synced motion)

(something like this - I really don't know what it looks like he hasn't posted the program he used to do that yet.. I will bug him.)
G0X[0.077250]Z[1.685525+0.100000]
G33K0.032000X0.077250Z1.685525
G33K0.032000X0.077250Z1.520525
G33K0.030000X0.077250Z1.489525
G33K0.028000X0.077250Z1.460525
G33K0.026000X0.077250Z1.433525
G33K0.025000X0.077250Z0.958525
G33K0.026000X0.079250Z0.919525
G33K0.027000X0.083350Z0.892525
G33K0.029000X0.092050Z0.863525

[samco]

yikes.. This guy is too smart for his own good

http://jmkasunich.dyndns.org/cgi-bin...k/fusee-1.html

^ he explains the program he wrote to do the fusee.

sam