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Messages - jimthefish

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231
General Mach Discussion / Re: Sound with out movement (JOG)
« on: November 16, 2011, 06:26:30 AM »
Hi Lou forgot to say watch out when dragging the sliders you will notice the graph numbers change. Thats how I could not get mine to work when I first set up the machine. I was on the highest scale  and the steppers could not handle the speeds I asked for. Jim

232
General Mach Discussion / Re: Sound with out movement (JOG)
« on: November 16, 2011, 06:03:11 AM »
Hi Lou its Jim, yes, I did mine by going on the motor tuning page and dragging the sliders on speed and acceleration till I got my motors to work. Remember to save the settings before trying them. When I had them working to what I wanted I noted down the figures for future reference. Start of with slow movements and build up till they start to give you problems. Back off a littel as changing directions a top traverse speeds can cause failures. Good luck.

233
Tangent Corner / Getting the right gear cutter
« on: November 15, 2011, 01:03:30 PM »
Hi I need to buy a gear cutter for cutting a 1.125 diameter gear with a contact DP of 1" and 18 teeth. what cutter do I need is it a 18-20DP but what number cutter do I need? I purchase a cutter thinking it was the correct one only to find the cutter cut teeth to wide. Help please

234
General Mach Discussion / Re: Mach3 pendant
« on: November 14, 2011, 03:59:22 AM »
Its now light down here so been down and got the drawings. Aint very good but they are 24 years old and been down the shed for a while.

235
General Mach Discussion / Re: Mach3 pendant
« on: November 14, 2011, 02:26:23 AM »
Just found this on youtube

http://www.youtube.com/watch?v=ol_sFbcKekM

Would have saved all that writing on the previous posting

236
General Mach Discussion / Re: Mach3 pendant
« on: November 14, 2011, 02:18:31 AM »
Yep it does have electrical diagrams but no mechanical drawings. Hood I looked at several ways of adapting mine before taking it off and flogging it. lots of problems with orientation of spindle and pnuematics so give up. The process to change a tool went someting like this
Call for tool number
machine goes to TCP
Proximity sensor on spindle orientates spindle to set position to line up driving dogs by reverse and forward spindle actions along with an electronic drive locking of the spingle motor
pneumatic cylinder drives the T changer towards spindle and engages into spring loaded tool holder on carousel (sometimes)
pneumatic release of tool holder from spindle (sometimes)
Pneumatic tool changed goes down to clear spindle and allow rotation to next tool
carousel rotates to new tool requires ( uses a stepper and a proximity sensor on the carousel)
tool change comes up with new tool  and locates in spindle and driving dogs (sometimes)
TC retracts (pneumatic)
spindle starts and continues with machining

The machine needed 100psi mainly to release the tool holding locking clamp, and unfortunately if the spindle got warm I used to tap the tool holder with a copper hammer to help release the tool. I used to be an engineering lecturer (mechanical not electronic) and this machine was in my department from 1988 to 2000 when I purchased it for home. It used to make chess sets on a machining cell with a denford Orac lathe, 2 robots and a conveyor. You are right about stepper driven axis by the time we had made 20 chess men the last one was 0.5mm smaller then the first. My machine now holds its size well so it must have been the Denford electronics at fault.

Hood there was 2 boxes full of electronics which I threw away when I got ride of the tool changer to a bloke from down south who bought the unit from me off eBay. When it gets light I will go down the shed (workshop) and look to see if I still have the wiring diagrams or pictures of the tool changer, if I have I will scan them and post on the forum.
Jim

237
General Mach Discussion / Re: Mach3 pendant
« on: November 13, 2011, 03:40:26 PM »
Hi again Hood, mine is a 1988 model and it had a tool changer on it. I took it off as it relied on pnuematices to open and close the tool lock and the electronics needed to spindle to be locked in a set position, the table at a home point and pnuematics also fed the tool towards the spindle. It jammed more times than it worked correctly. I dont mind standing with my hands in my pockets waiting for me to make manual tool changes. (keeps me awake). Jim

238
General Mach Discussion / Re: Mach3 pendant
« on: November 13, 2011, 02:57:42 PM »
Hi Hood mine had D34 steppers and a tray full of electronics. I think the 240 volts were fed sraight into the stepper boards where the voltage was reduced. As you know I aint very good at electronics, however I have the manual on the origonal Denford Traic if you want a photocopy. all I used of the origonal machine was the D34 stepper motors and the spindle drive. The rest I purchased from Roy at diycnc and the steeper drives off ebay (Hong Kong i'm afraid) they were half the price and 2 weeks delivery. If I had got them from the UK they were £70 each and 8 week delivery. I think the total cost of the conversion was about £300 as I blew up my first set of stepper motors because I cross wired two motors (told you I'm no good at electronics). If it moves and is covered in grease i'm OK, I know what i'm doing

239
General Mach Discussion / Re: Mach3 pendant
« on: November 13, 2011, 01:10:02 PM »
Hi Hood its Denford triac bench mill. Its brilliant and cuts well, using 10mm reground carbide endmills, I can take 2mm full cuts in steel with no problems, I make model steam trains on it so mainly Mild steel or Brass cutting . Have a look at my latest creation a mini bending roller fixture. All made on the triac and a Myford ML7

http://www.youtube.com/watch?v=BU7QFhHzRfc

240
General Mach Discussion / Re: Sound with out movement (JOG)
« on: November 13, 2011, 08:07:11 AM »
Hi Lou, I could not download your attachments, however I could not see the motor tuning page in you pictures. Its under config pull down called motor tuning. If you dont stick to the motor parameters they make terrible noises. I aint very good at CNC but that man Hood is if you can catch his eye on the forum. Jim

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