Messages

81

Tangent Corner / Re: Backlash in planetary gearboxes

« on: February 26, 2009, 12:40:28 AM »

Ok then, a 5 arc minute 10:1 planetary gearbox, would have .5 arc minute backlash on the output shaft... 

If you add a 1" diameter pinion on that shaft... then...

S=r*angle .......... S=.5*0.000145...........angle in radians... that translates to 0.000072" of linear backlash??
That seems too low... i guess i'll ask some manufacturer.

Best regards
Fernando

82

Tangent Corner / Re: Backlash in planetary gearboxes

« on: February 24, 2009, 07:22:09 PM »

Hey Brett,
Not really, i have never come to use any gearboxes for stepping up, and certainly not to 10,000 rpm!

at 10,000 rpm, bearings alone might cost a lot. (just guessing)

I might suggest using a motorized high frequency spindle with a VFD,
or trying to do it with a pulley system and a vfd on an induction motor.
If you get a 3000 rpm motor you might get away with runing it at 120Hz which will get you 6,000 rpm, then a 2:1 pulley system might do the job, just check belt ratings to see if they can take your HP at those rpm.
Fernando

83

Tangent Corner / Re: Backlash in planetary gearboxes

« on: February 24, 2009, 06:01:56 PM »

Bret,
I was thinking it was the other way around, i´d rather have 5 arcmin backlash in the input, and if the ratio is 5:1 then you'd have 1 arcmin at the output, which would translate into les linear backlash.

I might be wrong!
Regards
Fernando

84

Tangent Corner / Backlash in planetary gearboxes

« on: February 24, 2009, 02:39:09 PM »

Hello Guys,
I was wondering, when there is a specification for backlash in planetary gearboxes, they always say:
Backlash 5 arc-min for example.

Is it 5 arc-min at the input or at the output? anyone knows?

THanks!
Fernando

85

General Mach Discussion / Re: Height Following

« on: February 23, 2009, 10:52:40 AM »

I strayed from that proyect... and I have not implemented it yet.
It will be a while...
Regards
Fernando

86

General Mach Discussion / Re: Greenhouse automation with Mach3

« on: February 20, 2009, 10:55:30 AM »

Yea I thought about using just a plc, but he wants an HMI where he can see whats going on and change the times and timers.

And to be honest i dont know how to do that with just a plc!

If you can recomend an easy HMI i could start learning about i would appreciate it very much.


Thanks!!
Fernando

87

General Mach Discussion / Greenhouse automation with Mach3

« on: February 19, 2009, 11:35:58 PM »

Hello guys...

quick question...

Can mach 3 switch outputs on and off depending on what time of day and what day of the week it is?

I ask, because a friend of mine wants to automate a greenhouse... and i was wondering if mach could be used in the application.

He has not given details on what exactly he wants... but im pretty sure its just a monitoring of some sensors, and the control of some outputs governed by at what time they turn on, and for how long.

Best regards
Fernando

88

Third party software and hardware support forums. / THC300 or MP3000 material sensing routine

« on: February 19, 2009, 05:17:04 PM »

Hello Guys,
i have a question regarding the routine THC use to find the material initial height.

I know that the two systems i mentioned in the topic use a floating torch which lowers to the material, the torch tip touches the material and floats till it hits a limitswitch. Can this routine be modified?

I ask this because we would like to use the same routine but without having the torch touch the material (clogged tips, dammaged tips etc...), by activating an output to lower a floating foot to do the same thing the torch does... something like in this video...
http://www.manchestervideo.com/WinMedia/CNCPlasmaHeavy.wmv

It could be just like in the video, or without the prox switches and a floating foot.

Can this macro be modified?
Best regards
Fernando

89

General Mach Discussion / Re: Need help with 2.5D operation of Mach3/Galil system

« on: February 19, 2009, 04:42:00 PM »

nope... youll have to add the button and code the script

90

General Mach Discussion / Re: Need help with 2.5D operation of Mach3/Galil system

« on: February 19, 2009, 02:45:47 PM »

I've, just merged the two threads you started.

No need to start different threads regarding the same topic. Just lest chances to get your question answered...

I have no galil, and have never tried the 2.5d setting...

Couple of suggestions,
Make sure the Z is 2.5D on output#6 has a checkmark on the general config screen.

make sure you have a pin number assigned to the #6 output, and that is not assigned to any other output or input etc...

quick question, have you tried to add a button on your screen and script it to toggle output 6 on and off? just as a test that you can toggle the output trough mach3

regards
Fernando