I got a local components stockist by me but most of the time shop here....
http://www.dalbani.co.uk/index.php
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I got a local components stockist by me but most of the time shop here....
http://www.dalbani.co.uk/index.php
No real local supplies to me, there used to be a real nice unit on an industrial estate near me, you know a "REAL NICE" unit they did the stuff you could only dream of all the obscure stuff and if he didnt have it, he could get it, been in the buisness since valves and one day i went for a rummage, and the guy in the unit next door came out and said "Hey mate that old geeza snuffed it about 3 months ago, its a shame you didnt come a fortnight ago.. they skipped the lot!!!...:surprised: 6 bloody skips full :eek: " well lets just say i was very unhappy..:cry: Can you imagine how many electronics components it must take to fill 6 skips!!!!!!!!!!
so fleabay is the place I visit first Because im a bit lazy where stuf like that is concerned...:whistling::redface:
Farnell is still my supplier of choice now I have got over the £20 min order, still most price competitive... then RS, Cricklewood Electronics, Rapid, Digikey
Nice Tacho circuit here,Rick.
http://translate.google.com/translat...tm&sl=es&tl=en
Hey George, thanks for that, an interesting circuit, now added to my link list...
Rick
Rick, i thought of you today as i removed a front panel from a boxford 240 lathe, all those lovely switches never to be used again......:wink::tongue:lol
Rick, despite having a handheld tacho, you've made me feel I am missing something if I don't have one on the minilathe now! grrrrr lol
All those circuits using a PIC are fine but you note how there's never any source code to download or firmware to burn... so watch this space...
Forgot to post the email addy for that tacho,Rick...dunno if he read Enlish mind? lol
http://www.xbot.es/microplans/
george, do you fine that your computer misses a lot of letters out when typing, i had that trouble with my comp until i got a good quality kybrd.:heehee:
Funny you should say that,eye2eye...so does mine :rolleyes:
Must stop drinking my tea over it.
Yeah I need a new kebord
Well ive stated my reasons for wanting one and to be fair MACH does have the facility, However as i said mach says spindle go at 3000rpm, but there is no way of you knowing if the motor has obeyed this command, this could be a too higher feed rate lowering the spindle rpm, i just thought it would be nice for me to be able to see if the spindle was doing as it was told and maybe in the future incorperating a feature that lowered the feed rate to keep the rpm of the spindle at its desired speed, that is why i wanted feed rate control as well....Quote:
Originally Posted by irving2008
Quote:
Originally Posted by irving2008
I WILL BE WATCHING, BE ASSURED OF THAT lol
Quote:
Originally Posted by i2i
lol Well mine will look nicer!!!! all those pretty buttons, when my friends come around how complicated will that look.... (anyone can operate a pc my friends think) but this looks like rocket science to them.... lol ......:wink::tongue:
Quote:
Originally Posted by GeorgeD
Cheers George, the way i see it, even if i dont use the design it may be very usefull to other members should they wish to investigate the tacho question...thats what forums are about.. for a group of people to pool thair resources and help each other out to achieve similar goals and have a bit of a laugh and share friendships and experiences along the way.......so thats why i say "Im In!!"
Rick
A machine without flashing lights is .....Quote:
Originally Posted by Ricardoco
boring... lol
i tried several new keyboards until i came across this Dell keyboard which (touch wood) has cured the missing letters completely.Quote:
Originally Posted by GeorgeD
lol.....a machine with flashing lights is illumination, nothing more.:surprised:Quote:
Originally Posted by irving2008
You see the point i'm making is, when i press cycle start and walk away i don't care how many lights are flashing, or tacho's are counting.:sad:
The machine is working, and the sweet music i hear, is metal being removed.lol
CNC does not mean "cuddle not cut":twisted:
:tongue:
lol that did make me laughQuote:
Originally Posted by i2i
Hahbut...if a man with just a saw and a hammer walks on site he'd look like a cowboy....give the same man a hardhat and a toolbag and he'll look like a proffesional. :whistling:Quote:
....a machine with flashing lights is illumination, nothing more.:surprised:
Twang!!!! squeel!!! screach!!! i2i runs back to the machine, the expensive part in the machine has a big gouge out of it....Oh no...lol.Quote:
Originally Posted by i2i
.....Somewhere else in the world Rick notices that the spindle is not spinning as fast as it should be, a quick glance at the g-code shows mach is trying to cut too much material in the first pass, on closer examination the cutter is lower in the holder than it should be, it wouldnt have mattered much anyhow as the little enhancement passes the spindle speed back to mach and this alters the cut rate so when he walked away the expensive part would have been safe. :smile:
Quote:
Originally Posted by i2i
CNC also does not mean "computerised not controllable"
However i can see this debate and its anacronims going on for some time..
so I just say "que sera sera"
Rick..
Hey look at my avatar. lol Just for you i2i...
lovely avatar, does it control your keyboard.:heehee:
While i'm away from the machine everything cuts perfectly because it's computer numerically controlled. Mach3 does exactly what i tell it to do everytime i want it to, that's the trick when it's programmed.
But heaven forbid something would fail, as it makes no difference whether you have a tacho, a button for every controllable action and a light to show everything, you wont be there to do anything about it, unless of course you sit there and watch.:confused:
The only usefull thing on the front panel is the E-STOP:smile:
Hey C'mon that is a cool avatar!! i made that just to make you smile lol..
it did make me smile.
As you've been such a help to me and a good sport over this subject, i thought it only fair i do something for you..:naughty:Quote:
Originally Posted by i2i
Please see attached layout for you're information
It took me ages to design this with you in mind. :twisted:
Attachment 2618
:rofl::smile:
On a more serious note i2i, do you know what sort of temperature are these SD3 drivers heatsinks supposed to sit at when not doing anything??
they do run fairly hot, you should be able to touch the heatsink. If you're worried you could put a fan in there, some boxfords have a fan as standard.
Just think you could have a temperature controlled fan with a tacho and an led that gets brighter the faster the fan goes, and a digital thermometer for each drive. It'll be like christmas at Blackpool.
PS. i prefer the e-stop at the top.:smile:
Its funny you should say that, here is a little gadget i got to controll the speed of my dc fans related to ambient enclosure temperature... based on the input from some carefully placed sensors. :smile:Quote:
Originally Posted by i2i
Attachment 2619
I put the E-Stop at the bottom so you could use your hip to activate if your hands were out of action. lol:rofl:
Well i've recieved quite a lot of bits today so i will begin the sensor tomorrow but i will hold on in completing the tacho circuit in the hope that someone comes up with a closed loop design....and.....que irving lol
http://www.mycncuk.com/forums/showth...counter-thread...
dum tee dum tee dum....
Rick
Hey,Rick
Unit here for £22...thatll do nicely for my lathe sir. :dance:
http://medw.co.uk/wiki/index.php?page=Tachometer
Now thats nice, Thank you, thats another link for the list lolQuote:
Originally Posted by GeorgeD
Ok fitted BOB today, all axis move in one direction only!!! but sound rough and move very slowly so a bit of sherlock is required (par for the course, how much is simple nowadays)....
Rick
Check for voltage at Dir +&- also pulse? on BOB inputs
Well it is an opto isolated board with LED's on all outputs so i know it is getting pulse direction info but im on case!!!Quote:
Originally Posted by GeorgeD
LOL how stupid can one get....derrrrr forgot to connect GND on BOB. All Axis now work both step and direction!!! im off to play for a while and tune the motors :)
Ok im going mad,, will someone take a look at these two items and tell me how they interface and how they connect to the bob please ive tried for two hours and when it gets to that my experience tell me im doing something wrong...
there are only three connections to the lenze 534 to the speed interface and although it only shows 1 connection to the breakout board there is also an rtn connection.....:confused:
Lenze534 vfd
Attachment 2627
pins 7,8,9 are for the speed control using a 10klin pot or circuit below
cncdoctor speed controler
Attachment 2626
0-10v on speedcontroller TB2 to pin 8 on LenzeQuote:
Originally Posted by Ricardoco
0v on speed controller TB2 to pin 7 on Lenze
+ve on speed controller TB2 not connected
STEP on speedcontroller TB1 to BOB Output (typically pin 8)
RTN on speedcontroller TB1 to BOB Ground associated with the chosen output
Do NOT share the grounds... they may not be the same ground level...
Thanks irving, did you know what the rtn connection on the speed control to bob is..
RTN = return
lol ok so is it supposed to be conected anywhere? ive connected the step to pin 8 on the bob is that the only connection to the speed control board...(i suppose i asked for that lol)Quote:
Originally Posted by irving2008
see my post above... connected to BOB ground alongside pin 8