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Author Topic: Travel speed  (Read 11449 times)

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Offline Hood

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Re: Travel speed
« Reply #30 on: September 07, 2010, 02:24:56 PM »
With servos your motors rated speed determines your max velocity, or rather it should. There are several things which could affect this such as you running a lower voltage than the rated speed is given at. The pulse rate needed at that speed could be too high for the kernel.

What is the rated speed of your servos and is there any gearing between motor and ballscrew and what pitch is the ballscrew?

As for the version upgrade, what problems do you get?
Hood
Re: Travel speed
« Reply #31 on: September 07, 2010, 06:51:14 PM »
Hood
I have a Lagunmatic the servo motor are 500 in oz torque, 2500 rpm, V/K =40 V@120 DC i have them running on @ 50 Volts DC they have the normal pulley belt drive i had all the ratio's figured out but can't find it at the moment.
On the update version's i found that the graphics were bad and the arc's went wonky the present version i am using work's this is the reason i am afraid to change it.

Dennis 

Offline Hood

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Re: Travel speed
« Reply #32 on: September 07, 2010, 07:12:44 PM »
So you are looking at about 1000rpm max motor speed at 50V if I read that correctly. So you can work out what the max velocity will be from there. For example if  one rev of your  motor  moves the axis  5mm then max velocity would be 5,000mm/min, so all you need to do is work out the gearing and the ballscrew pitch  and you will know roughly what your max velocity will be.


Hood
Re: Travel speed
« Reply #33 on: September 07, 2010, 07:28:12 PM »
Hood
Will this effect the actual movement in terms of part dimension's so hopefully i can explain what i mean using the midi line i do a move to check that the machine moves the correct amount say 25 MM and it dose will changing the velocity change this as i understand it that's in the unit's per correct me if i am wrong.

Dennis 

Offline Hood

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Re: Travel speed
« Reply #34 on: September 07, 2010, 07:34:12 PM »
Changing the velocity wont affect the dimensions, that is as you suspect set by steps per unit so as long as you keep the same steps per you will be fine..
Hood
Re: Travel speed
« Reply #35 on: September 07, 2010, 08:02:09 PM »
Hood
OK with that said then my thinking is now that i am way down on velocity @ 950 i should be able to increase it up to lets say 4K what do you think to high or should i go a little at a time and see what the machine will take what should i expect ?

Dennis

Offline Hood

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Re: Travel speed
« Reply #36 on: September 08, 2010, 02:23:10 AM »
Without knowing the gearing and ballscrew pitch I dont know what your velocity will be.
If its a fairly large mill then 4m/min should be fine, I run my Beaver NC5 at 8M/min.
Hood
Re: Travel speed
« Reply #37 on: September 08, 2010, 12:20:10 PM »
Hood
is that M for million or ? yes it is a large mill with some big power i don't need it to go at light speed i just need it to cut at a reasonable speed.
Thanks again for your help and response to my question's.

Dennis

Offline Hood

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Re: Travel speed
« Reply #38 on: September 08, 2010, 02:06:22 PM »
That M should have been m and is for meters.
Hood
Re: Travel speed
« Reply #39 on: September 08, 2010, 05:25:36 PM »
Hood
OK you have to remember here in the US we are in a combo mode meaning metric and standard, i pump up the velocity to 3000 and then tried a rapid move through the jog control but the drives faulted out so i moved it down to 2000 seams to be OK with this amount i am cutting air right now with a file i have been working on and it seams happy also have Mach set in CV mode looks a lot better anything else you could recommend thanks again.

Dennis