Thread: The illusive Boxford 260vmc
There is no brake resistor in this circuit but i dont think it will need it... the stop time from 3500rpm to 0rpm at the motor spindle is less than 2 seconds..Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
Any light at the end of the tunnel yet?
on a side note ive almost finished my chineese tacho as a stand in untill something better comes along lolAlways bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
With the spindle control done, Ive decided to tackle the Limit switches... there are proximity switches present on the machine of the type below:-
these were again connected to the old main logic board now thats gone does anybody recognise this type of switch, i know i could change them for micro switches but as they are going to be used for limit rather than Home switches i would like to utilise them if i could...So any ideas???
Label says 36vdc 200ma BN=L+, BK=OUT, BN=L-.
Last edited by Ricardoco; 15-08-2010 at 03:37 PM.Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
They could be Reed switches,Rick?
I doubt it, a reed switch wouldnt need a 36v supply. These are active devices.
Rick, is there a magnet or something to activate them? Or are they just activated by the table?
I thought you would know i2i lol , well while the site was down I managed to track down a data sheet and now these proximity switches are operational with a nice little relay board, I think they were used as home switches in the original design as they only operate at one end of each axis only, I understand this is not the best way to go as the repeatability is not good, so im going to get the drill out at sometime and drill the recesses at the other end of the axises and use them as limit switches.
Ive still not got out and completed fitting the tacho yet, although Ive got all the bits as i had to take a break and goto work, yuk! yuk! yuk!.
You're right they are used as home switches, and i suppose as long as the area is kept clean they would be ok for the job.
Do you have a schematic for the relay add on.
Looking at the data sheet it looks like it will drive a small relay direct, or even switch an input to ground.
Last edited by i2i; 17-08-2010 at 03:01 PM.
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