[rokag3]

by the way if you have problems of motion control glossary
http://www.pmdcorp.com/support/glossary.cfm
unfortunately this site is more for Mr kreutz but the product look very powerfull and they said cheap ?

[rokag3]

Hello rokag3,

I can offer very inexpensive scales to you that either have A and B signals or A/ A not & B/ B not signals. The scales are 5 volt TTL square wave out of the encoder. The resolutions are 5um/.0002 inch or 1um/.00005 inch. My e-mail address is [email protected] if you want more information.

Regards,
Tim

Very impressive price but the catalogue price and the price you give me are very different how comes?
about CNCBRAIN WHAT THEY SAY IT'S DREAM ON EARTH so ask them for a video
http://www.cnczone.com/forums/showth...=59763&page=25

[rokag3]

hello,
I have a 5 micron linear scale I think that ballscrew are the real problem for linear encoder.
acme or roller screw with no backslash
http://www.cnczone.com/forums/showpo...&postcount=375
might work pretty well I will be able to talk more about it in few weeks but the natural backdrive of the ballscrew it's a problem it is also a problem for human since it's very difficult to operate a lathe manually with ball screw(ok i do not like them too expensive and not DIY device )

[rokag3]

hello.
I make some test and i arrive to this conclusion
if you use a big ratio motor/screw then you multiply the backslash
and you will have hunting
all the goal must be to avoid the possibility for the servo to take too much inertia
so have a small demultiplication servo/screw
also the link between the load and the encoder must be very very well made using shortest link as possible and cast iron or equivalent link use some material to absorb vibrations between the chariot of the encoder and the scale.
your load/encoder link is good if while machining with vibrations (not too much cnc is supposed to work with a limited amount of vibrations)your dro keep the position clean without jump on the values
if you do that it work fine.
we will test on our mill soon (with roller screw diy)the amount of backslash is <1/100 mm (flexibility not backslash) so the servo cannot take inertia and thus it should work perfect.
if your servo is less than 10deg free on 360 and your linear encoder clean under reasonable amount of vibrations it will work.
flexibility is not a big issue since your servo is under load and will not take too much speed

[LMSC]

Very impressive price but the catalogue price and the price you give me are very different how comes?
about CNCBRAIN WHAT THEY SAY IT'S DREAM ON EARTH so ask them for a video
http://www.cnczone.com/forums/showth...=59763&page=25

Everyone always asked for list pricing. I made a file with list pricing in it so everyone would stop asking.

I buy directly from the manufacturer. I can offer at least 50% off normal pricing because I don't have any distributors. Why pay some else to do the same work I can do and still make the same amount of profit.

Regards,
Tim

[rokag3]

hello Tim.

Still have a lot of interest for it. Better late than never .

Give the address where we can find your price list will be great.
I know that Mariss from gecko or kreutz hp uhu can make double closed loop. It's only the scepticism of the machinist commuity and the price of glass scales thats break and they have been discouraged to implement it (hope they will make an option at least)
regarding CNCBRAIN wait wait wait wait and still do not see !

double closed loop are not 100% solution there is never 100% solution but it can greetly improved performance of a not very expensive machine