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Messages - larryc

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21
General Mach Discussion / Re: Bad BOB???
« on: February 20, 2011, 06:31:54 PM »
Okay I was just wondering I just used 3 geckos 210s and a c10 board found at( cnc 4pc)  it works well and I never had any problems. I was going to use a 4 axiz board when I started to design the mache 4 years ago but quickl changed my mind for the  same reason you are changing boards now If one axiz goes you chang everything . with a interface board and three or 4 geckos just unhook and change the part you need.  I was wondering are you sure you dont have a problem with mach a adjustment or somthing. one of the other forum members in this section on the same page was having trouble with his motor stoping for a second then starting again. somthing to do with his setting I think . Check his site and see if he is having the same problem.

22
General Mach Discussion / Re: Bad BOB???
« on: February 20, 2011, 05:36:26 PM »
why are you going to use a 540 geko drive I use a 201  or 210 gecko drive with a  c10 interface  and I have no trouble I think the gecko no. is 210 look at there web site It works well for me . I use 450 stepper motors  Cheaper than the othe bigger driver.

23
General Mach Discussion / Re: Steppers out of sync and skipped steps?
« on: February 19, 2011, 09:05:29 AM »
Sure you dont havr the motor set back wards I had the same problem when I first turned my machine on. All you need to do is switch around two of the wires so the motors run the other way. Like i said the motors hooked up in pareal will not work. dont ask as I dont know why. Probly a big forumla. If you leave the motor in it will work for now. But it will give problems later on. Just be prepared to remove them later. nice work.

24
General Mach Discussion / Re: Bad BOB???
« on: February 19, 2011, 08:56:47 AM »
Sorry hood you are right my math isnt my best thing. thst is why I said aprox.

25
General Mach Discussion / Re: Hold Down Clamps
« on: February 18, 2011, 10:30:11 PM »
Why dont you make you own clamps I was looking at buying some didnt have the money Then in the v carve pro forum someone put a posting on making clamps   All it was was a 3/4 inch board the clamp is 2 inches wide about 4 inches long  make one step 1/3 the thickness then another step with a 1/4 inch left. This will leave 3 steps one 3/4 inch thick one1/2 inch thick one 1/4 inch thick. I set up the cutter to cut 5 wide on the board  put a few rows and in 20 minutes I had 30 clamps made at a few cents each. Oh I had to put a hole in them to put a screw threw to clamp them to the table top. bolt head soldered or brazed to a washer with both sides flattend will make a T bolt.Put a wing nut on the top  Simple and looks like they were bought.

26
General Mach Discussion / Re: Plasma fires and makes Estop
« on: February 18, 2011, 10:13:34 PM »
Did either of you get a new torch. I read some place in a torch pamflit about cnc controling of plasma torches and It said that some plasma torches woud trip the e stop. If I remember right some torches use a high frequncy arc to start the torch. And this caused a feed back through the input cable. they said to make sure all the cable was well sheided and grounded.I cant recall everything that was said but I came away with the understanding of dont use a torch with high frequency starter. might be somthing to check.

27
General Mach Discussion / Re: Bad BOB???
« on: February 18, 2011, 09:59:09 PM »
the voltage should be around 10 to 20  times the motor voltage if the voltage per coil is 2.5 volts at 1 amp for example you could use any thing from 24 volts to 50 volts dont forget when you take for example 20 volts ac and convert it to DC with your compacitor in line the voltage will increase 1.5 per cent so now you have 21.5 volts this is all aproxamite but all within  a volt. look on a forum called   mechmate.com    they have all the formulas and infermation that you need to check machine build problems . They were out of south africa now it it run out of the U.S.

28
General Mach Discussion / Re: Steppers out of sync and skipped steps?
« on: February 18, 2011, 11:08:08 AM »
Nice machine there .the v wheels are perfect. They will keep track just about as good as 500 dollar linear bearings . That is if they are lined up. But if you took one otor of the end of each axiz and put a idler pully on the end it would save a lot of work. also your machine would be more stable. I would put a shaft all the way across the x axiz or long axiz from one side of the machine to the other put it in pillow block bearings this could be either motor end or idler end that way you could move you machine with one motor insted of 4 motors. much easyer and would look a thousand times better. You machine from what I can see is like the mechmate design. Check there site out you would be suprized by what you see. and they can give you so much information. If you put the shaft on the lmotor end you could gear the motor down . to give more ower . and make it cut smother.also with one motor it will save you hundred of dollars on motors couplings .drivers etc.  nice machine though.

29
General Mach Discussion / Re: Steppers out of sync and skipped steps?
« on: February 18, 2011, 09:18:33 AM »
dont feel bad Three years ago I was in the same vote as you .No lathe never built a cnc machine etc. 6 month later I designed and built a machine that would rival the 100,000 dollar machines . And let someone tell me different. Go to a sight call mechmate.com You will be suprised at what they are making. And I mean people from all over the world. they have a forum they sell plans that are one of the best . A couple of years ago the plans were free. now I think they might be 100 dollars. All my motor shafts are 1/4 ingh so are the pully holes. The jack shaft that I use is 1/2 inch it is the same size as the bearings Then I bored out the bigger pullys to fit . On that site I told you about it tells you how to grind rails how to bore pullys without a lathe only a drill press and grinder etc. check it out.

30
General Mach Discussion / Re: Bad BOB???
« on: February 18, 2011, 09:04:43 AM »
have you got a capacitor on each driver as well as a main one in the power supply. If not maybe there isnt enough power to run both motors at the same time

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