Printable View
View from below Driver rack ready for Logic voltage mods.
Attachment 2558
New tracks added ready for drilling and component additions.
Attachment 2556
Solder side view with Components added and soldered
Attachment 2559
Component side view
Attachment 2557
All done, and ready for fitting back in machine...(maybe):wink:
Rick
Thanks George, I did consider going down that road and I may even buy one as they are a very reasonable price and usefull for other things, but i wanted to encorperate it into the machine nice and neatly, which as ugly as it may be the Trexon fitted the bill. Or even something similar I could get my hands on without waiting for eternity, but it seems that this type of circuit is not available off the shelf in the UK which im gutted about.Quote:
Originally Posted by GeorgeD
I have so little time in my day as it is, being a 12hr night shift worker, the only real time I can spare is sleep time, but it seems I will have to go down the Microcontroller road, as nobody on here at least can suggest any other alternative off the shelf solution to the Trexon .....:(
Rick
neat way of adding the level shifters... looking good...Quote:
Originally Posted by Ricardoco
Think outside the box,or in this case inside:heehee:Quote:
Thanks George, I did consider going down that road and I may even buy one as they are a very reasonable price and usefull for other things
Buy one, position the foil somewhere on the spindle,strip down the tachomete handheld unit,unsolder the the sensor and put/mount the digital readout in the front of the case n the boxford,solder some wires to the sensor and resolder the wires from the sensor to the digital readout unit.
you missed two vital points George... firstly its not a sensor but a laser reflectometer which is only rated for pulsed usage and secondly, they are not continuous reading but 'read-on-demand' therefore need a push-to-read button ... as a speed readout its not that useful....Quote:
Originally Posted by GeorgeD
Thats what I had in mind, but using a parallel interfaced display.. more common to find, cheaper to buy and easier to program.. for the added complexity of 5 more wires...Quote:
Originally Posted by GeorgeD
Take a look at this.
www.e3b6a5y.com/365/WiringDiagrams/365um6150rpfTACHO.PDF
It seems to fit the bill?????
except it can't deal with the 50:1 reduction neededQuote:
Originally Posted by Ricardoco
Ok the new break out board, power supplies and speed control interface mounted and ready for wiring..
Attachment 2569
Rick
Yes but it would seem to be easier to change from 50 holes to 1 than to design circuit, buy parts, assemble board, program board.Quote:
Originally Posted by irving2008
well £24 delivered isnt bad...
blanking out 49 holes might not be as easy as you think, you might need to provide an alternate sensor. Also if you do blank the holes you'd prevent using it for closed loop speed control later...
I liked the look of it, its fit for purpose and the price is not bad, although im not sure if i will end up buying another sensor, it will be interesting to see what that chip is on the back.Quote:
Originally Posted by irving2008
As always im thinking you are correct, maybe ill just mount another sensor on the spindle and be done with that, mind you i couldnt find anything suitable on fleabayQuote:
Originally Posted by irving2008
Rick
This may sound stupid, but im just wiring up the drivers to the BOB and i was wondering if there were default ports used for axis, IE X=pin??? y=pin??? etc.. I do like to keep things default, as it makes things less complicated If I get problems.
yes there are...
Typically (courtesy DIYCNC)
1 Charge pump signal Enable18-25 Ground GND
2 X Direction X Axis
3 X Step X Axis
4 Y Direction Y Axis
5 Y Step Y Axis
6 Z Direction Z Axis
7 Z Step Z Axis
8 A Direction A Axis
9 A Step A Axis
10 Input 1 Input pin
11 Input 2 Input pin
12 Input 3 Input pin
13 Input 4 Input pin
14 Output signal Output pin
15 Input 5 Input pin
16 Spindle pulse Output pin
17 Relay 1 Output pin
Hmmmm.... childs putty will do nicely methinksQuote:
blanking out 49 holes might not be as easy as you think
George,
I really wonder sometimes if you say things just to wind people up. or did you miss out on potato guns in your childhood? now go calculate the force delivered in your eye from a pea-sized lump of putty due to the tangential velocity at 3000 rpm
Quote:
Originally Posted by GeorgeD
Hey Rick,can you pop some putty in two holes of those holes when you get the machine up and running....if the putty flies out I will buy Irving 2 pints a day for the next 12 months.
Push it in the holes and cut off the excess both sides of the holes.
:heehee: Hmmmm Hey Irving, Being as i would be the one giving the results of this, what do you say 365 each!!! lol :whistling:Quote:
Originally Posted by GeorgeD
Hey George, thanks for the suggestions. its nice that you take the time to reply.
Rick
Hey Irving, thanks for the pinouts, thats made life a little simpler, i notice that there is only 1 pin for spindle output pulse, on my board from cncdoctor there are two,one terminal labled "Pulse" and one "RTN"...
Also Ive been looking for a sensor for this display i found on fleabay with no luck, do you have any suggestions?
look on fleabay for "slotted opto", returns half a dozen options... just the device.. will need mounting on a small circuit board with a couple of resistors, and you'll have to rig up some sort of vane on the spindle to interrupt once per rev...Quote:
Originally Posted by Ricardoco
Alternatively, and more easily, if you are set on the ebay display, use a 74HC390 divider chip to give a 'divide by 50' with only 1 chip and 10 solder joints!
If you have any old disc drives? these had a slot opto in them.
Ok that sounds good but this is uncharted ground for me, the 74hc390 seems like the way to go and i will get a new slotted sensor just to be on the safe side as i dont know if the existing one is ok, you make the circuit sound so simple ill just trust your judgement over mine:confused:Quote:
Originally Posted by irving2008
Rick
Im going to have a look and see what ive got, im sure ive got a couple of big old mice hanging around as well, and i think they have something similar in them..Quote:
Originally Posted by GeorgeD
Rick
Hah,yes forgot about the mice :wink:
The ones I'm on about are the type in your Noahs base computer ie 51/4 floppys.
Ain't you got a maplins by you?
Progress Report
The initial inspection has been completed,
and Redundant system hardware identified and removed along with ancilliary wiring.
New control systems identified, evaluated and purchased.
New system requirements.
Electrical Systems
Computer system hardware.......................Completed
Stepper control systems...........................Completed.
Front control panel fabrication....................In progress.
Spindle Speed control...............................In progress.
Spindle Tacho..........................................In progress.
Relay controls.........................................N ot started.
Limit Switches.........................................N ot started.
Software configuration..............................Not started.
Mechanical Systems.
Ballscrew inspection..................................Comple ted.
Bearing Inspection....................................Comp leted.
Motor Refurb............................................ Completed.
Lubrication systems...................................Not started.
Other Stuff
Not yet considered ?????????
Well i dont think ive forgotten anything buts thats a little progress report.
I must say A big thankyou to everyone who has helped me with this project so far with particular thanks going to Irving, George and i2i.
Onward!!
Rick,Quote:
Originally Posted by Ricardoco
Circuit attached...
I'm guessing the opto will need to be powered so I have shown likely values (330R/4k7) for the resistors needed to energise the LED and bias the receiver. If you knew what type it was I could give you better values but these should do.
Quote:
Originally Posted by irving2008
Thanks Irving, I went for the H22A1 type sensor if thats any help. I couldnt see Attachment there anywhere ...derrr lol
OK, you might find that device a tad slow. You could try 75R instead of 330R and 1k5 instead of 4k7. Otherwise you may find counting is erratic. Alternatively the circuit attached should help...
Im happy to get what ever device you suggest if you think that one is going to be a tad slow, im just not sure which one to go for, just let me know and ill get it..Quote:
Originally Posted by irving2008
Im designing the front control panel and was going to use Acrylic, I decided that the black stuff that when engraved shows through white like office signs would be the way to go, does anyone know what it is called because I cant seem to find any on fleabay but it maybe because im not using the correct terminology... Any takers??
Rick
Plenty of Tachometer schematics here.
http://www.google.co.uk/images?clien...og&sa=N&tab=wi
Acrylic
Try perspex or lucite or ... http://en.wikipedia.org/wiki/Acrylic_glass
Popular for computer case mods: http://www.chilledpc.co.uk/shop/inde...0c1372822fcb30
also amongst model makers: http://www.modelshop.co.uk/category/...lphabeticalAsc
and not too expensive :)
Don'tknow about your query for the acrylic Rick,but I found trent plastics very cheap on ebay....
http://cgi.ebay.co.uk/ws/eBayISAPI.d...EOIBSA:GB:1123
Oh sorry people, bad description by me, I wasnt having probles finding acrylic/perspex, I was having trouble finding the dual colour stuff that engravers use to make door signs and stuff, its usually black but when you engrave through it, a lighter colour, usually white is revealed to show the lettering, sorry.
If i cant get it i can see i will have to do the engraving, then get out the enamel paint and fill the grooves with white. (yuk.... not my fav idea but needs must)
Rick
Couldn't you buy clear acylic and a sheet of black stickyback film,cutout the legend on the film then stick down over the clear acylic.?
The short answer is yes, and its something i did consider but Ive done something similar in the past and it did look good....for a while but by the time the swarf on my fingers and oil and greese took its tole it was peeling and didnt look so good, but thanks for the suggestion as i may have to find a more DIY approach in the end.....Ahhhhh decisions, decisions, why is it so complicated to do even the simplist things.....:cry:Quote:
Originally Posted by GeorgeD
Problem is that it has so many trade names, or even none.
ABET is one , Traffolite is another.
and these people have no name for it
http://www.bayplastics.co.uk/engravinglaminates.htm
Thanks John, thats more than i knew a moment ago, its very odd that it dosnt seem to be available by the sheet, that is when you can figure out what its called lolQuote:
Originally Posted by John S
It's called phenolic don't know if i spelt it correct, I used to use it for engraving I have a small sheet of Black with White centre and larger sheet White with Black centre
phill