Set steps problem I think

[grahamshere]

Hello fellow cncer's. Ok im having a problem. When i run a file like the road runner it dosnt come out right, kind of one big blob. and very small. Now i watched the trouble shooting video and did the set steps per unit, i would punch in 5 inches and the machine would move .75", then it would back and say it needs to change the steps per units which it does, then id test it again and it would not move and the motors would wine like im doing now lol. im not sure if theres some thing eles im supose to set up, like maybe somthing about the treaded rod im using, like the tpi , Im running 425 xylotex with 5/16, 18 tpi allthread rods. maybe somebody nice can tell me whats a good set up for this unit i have. Thanks Graham

[SORCHEROR]

im not that familiar with that driver,what micro steps is the board set too,is it 1/8?1/4,1/2?let me know and ill figure out a start point for motor tuning

[SORCHEROR]

when you change the steps you also need to change the acceleration and velocity to match,if your driver is setup for 1/8 micro steps,you figure the steps like this,your stepper is 200 steps per rev.your thread is 18 tpi,so it takes 18 turns to move 1 inch,so 18 times 200 =3600 steps to go 1 inch,now your driver is set for 1/8 micro steps,so 3600 times 8=28,800 is what you need to set the steps for in the tuning,than adjust the velocity and accel to match,move the adjust bars till they sound good or work good,did you also set the units to inches?before you started?

[grahamshere]

Thanks for replying sorcheror. Ok now you got me, Im realy new to this so when you say set my driver for 1/8 micro steps im lost, i know that it had to be done but i didnt know how or if i did it with out knowing. so if you can explain id be great full. When i run my motors at 28000 steps per and velocity at 60 and accel at 10 things seem quiet but i check set steps per unit it dosent do 5 inches like a ask it too, just 1 inch or dosent move at all, and yes it is set for inches not mm, thanks again. Graham

[ger21]

Xylotex should be set to 1/8 step mode and 28800 steps per unit is correct. Try going to MDI screen and entering G1 X5 and see if it moves 5 inches. It should.

[grahamshere]

Yuppers it work I put in g1x5 and that what i got, first time i put in g0x5 like it said in the troubleshootin video, so how come every thing i machine comes out small, I tryed the boat that comes with 3dcut which is supose to be 10"x 12" or something like that, But it came out maybe 2"x2" and not looking like anything, Though i was using 1/4 end mill. Thanks ger , I may sound weird but you do amaze me at times,im Just happy i guess , one step closer to using my machine. Oh how do i check to see if im set at 1/8 step mode? Thanks so much Graham

[SORCHEROR]

you have to check the driver boards intructions,there are jumper setting on the board,if you lost the paper work go to there web site,maybe on there,they will either has flip switches or removable jumpers,set it for 1/8 micro step,and make sure you set the machs motors tuning step to 28,800,in your previous post you wrote 28,000,your ,another problem is your setting velocity and accel too high,you are missing steps at that rate,the motor will skip or stall,start with both at 5

[ger21]

Like he says, there are jumpers on the board to set the microsteps. But if you moved 5 inches with G1 X1, then you're set to 1/8.

If G1 X5 was right, then I'd think the other stuff may not be what you thought it was. Try a bunch of simple g-code commands in MDI mode, or some very simple programs to make sure everything is set correctly.

[grahamshere]

Thanks again sorcheror and ger, you guys are awsome, guess i just have to fool around with it some more, think the x and z are good just need to set the y, seems weird that the y would be different from the other axsis. Ill try the road runner in mdi and see what happens,Thanks again, Graham

[ger21]

reading it again, It could be possible that you're just trying to go too fast like he said and it's not really moving at all, just stalling. Try it really slow like he said.

MDI is for manually entering single lines of code, not running programs.

[grahamshere]

slowing it down 20" unit per and accel to 5" did it, so thats slow, but it seems to work but its backwards, im getting closer but not happy with 20 inches per min, guess thw only thing to do is? change the rod maybe? thanks for your help guys, every thing you say works. Graham

[SORCHEROR]

the most you will do is 25 IPM with 425 motors and those drives with 18 tpi screws,the 425 have more torgue at low speed but loose top end performance with 24 volt drivers,you get more top speed from the smaller ones that operate on lower volts,i have 497 and they were worse than my 253,until i switched to 48 volts and geckos 201 drives,now they fly at 60 to 70 IMP.i have had them up to 90 but on a mini mill it was scary fast,im not sure with 5/16 screws you want more than 25 imp,if you switch go for 1/2-10 double start,good luck