Thread: Monster CNC ,quick flying , 2 axis for Carbon fibre winding

7.2m long and has to run from standing start to stop at the other end in less than 10 seconds

Unless I calculated that wrong thats 43.2 Metres a minute, you wont get that with stepper motors, you'd be better looking to servo motors even then im not sure if you'd get those sorts of speeds.

Sounds like an awesome adventure. 43.2m/min is quite a feat in itself, which will in turn cause even more issues with stopping/saftey and limits etc. But that will come in due time. I wouldn't think it is impossible since i have seen laser machines capable of close to those speeds, not to mention i can get over 15m/min out of my machine on R&P with steppers and mine is reduced 4:1 so techinically a direct drive could get me 60m/min which is well over your required. Servos would be better for the speed though and acuuracy.

Look forward to seeing it.

Daniel

Oh and by the way, if you start looking at pulleys and belts, try econobelt in america, with the dollar so strong it makes their prices really cheap. I ordered a bunch from them and very happy.

Daniel

For pulleys and belts try AusXmods.
Metric, prices are very good and local company.
As a matter of interest to others he now stocks shielded cable for spindle/VFD.

You might like to contact Peter Donders to see if he is willing to give away any information on the machinery he used to make his carbon wrap bench. I'd imagine the cure times and process would be directly comparable to what you are doing - IF I understand your description properly.

The Making Of: Peter Donders Carbon Fiber Bench | Carbon Fiber Gear

I first came across his work only recently as I was researching my own furniture designs and the implications of CAD modelling and CNC and resin based materials like carbon and fiber. I hope it helps.

Originally Posted by Ch4iS

Unless I calculated that wrong thats 43.2 Metres a minute, you wont get that with stepper motors, you'd be better looking to servo motors even then im not sure if you'd get those sorts of speeds.

yer i know its not going to be an out of the box solution but its just about the torque and gearing , the step resolution at 10mm per step makes it easy ( will end up higher resolution by default ) seen some nema 34s 1600oz , but will need a stepper driver capable of 160v switching( hard to find ) let alone the 3000oz nema42s , still looking at motors , but 4x 3000oz on the same axil would be a good start .

Originally Posted by Ch4iS

Originally Posted by Ashore
God must love stupid people; He made so many of them

??? get stuffed

Originally Posted by twistedfuse

Sounds like an awesome adventure. 43.2m/min is quite a feat in itself, which will in turn cause even more issues with stopping/saftey and limits etc.

yes ive been thinking off the belt snapping power if the motors just stop , and how to set up a soft stop override , ive used the ultrasonic distance measurer's from basic stamp before ,mm accurate under 1m , might have to brush up on my rusty c++ skills and write "millisecond delay between clock steps for each 10mm of travel closer to the end stops " add on for mach3 ( or look for one ) to slow the steppers down at both ends before hitting an "all stop" limit switch , and a sign "caution . this machine wont give way " might help

thanks for the posts of bearing and belt suppliers , i just found out CBC (consolidated bearing company)Australia has a large selection of gear , and has a local distributor here in NT
INA-FAG - Linear Bearings, Needle Roller Bearings, Cylindrical Roller Bearings & Spherical Roller Bearings. for rails , and sell belt drive gear and pillow block bearings as well , will see how there prices fair to USA with there " make the postal service richer than all USA's exports" UPUS postal prices

Originally Posted by SawDustSniffer;1

Quote:
Originally Posted by [B

Ch4iS[/B]
Originally Posted by Ashore
God must love stupid people; He made so many of them

??? get stuffed

Hi SawDustSniffer
I don't think that was aimed at you, it is a part of his signature.

See here

Bob

Originally Posted by SawDustSniffer

yer i know its not going to be an out of the box solution but its just about the torque and gearing , the step resolution at 10mm per step makes it easy ( will end up higher resolution by default ) seen some nema 34s 1600oz , but will need a stepper driver capable of 160v switching( hard to find ) let alone the 3000oz nema42s , still looking at motors , but 4x 3000oz on the same axil would be a good start .

Ah ok, gear it up with a powerful motor.

I've got some 1700 oz-in motors on the way if interested, 7A with a max voltage of ~87V they are aimed to be used with the Geckodrives the G203V or G201X (7A, 80V Max)

Originally Posted by SawDustSniffer

??? get stuffed

lol, its not directed at anyone its been in my signature for a long time.


Regarding bearings ect. VXB have some excellent prices.

http://www.vxb.com/

won a pc on Ebay today , one i wont cry over when smoke comes out of it , the suppler has several ex-rentals (cleaned and tested ) for AU$80

Intel Pentium 4 dual core ,17inch flat screen ,dvd , bugger all ram , 40gig HDD for $80

HP DC7100 'WHOLESALE' PC + 17" Flat Screen + Key & Mou (eBay item 250732202490 end time 01-Dec-10 18:29:19 AEDST) : Computers

thought someone might like a cheep PC

one other thing I wanted to post for you was some awesome stuff by Mike Everman. This might be of interest to you champ.

Best belt drive ever! (If I do say so myself) - CNCzone.com-The Largest Machinist Community on the net!

This thread has LOADS of information, including some nice drawings others have gone to the effort of making and sharing. I hope it helps you out some.

Originally Posted by newflavour

one other thing I wanted to post for you was some awesome stuff by Mike Everman. This might be of interest to you champ.

.

that is cool
thanks
im still working on my design , now thinking if im gonna build a cnc machine i should make a good one ,

i can see problems with the length of the wires , 7.2 travel , will have huge inductance problems and voltage loss's

thinking of making an accurate 1200x1200x1200 and putting the 4th axis on the flying beam in the centre
only one axis on long wires or a single power lead and a remote info sender , radio is subject to noise , i dont think a laser would suffer "Doppler" problems at 1m/s ( <2m/s>) so a laser for each of the motor wires and a simple fast "opto > power supply > motor " board on the 4th axis ????
im still thinking

a newbie question
if the black box ( stepper driver ) has a max of 80v , can you run the full 80v or do you derate it by 1.4 to allow for gauss feed back ( spikes ) ??? , around 60v

i was looking at some large 1600 and 3000oz/in steppers on ebay , there internal induction of 22 , 15 , would put them at 160v , 110v , lol , they sell them with a 24v power supply and a 80volt max stepper driver box and no capacitor to catch the spikes ???? look out ???

thinking of ripping the high voltage side of the driver's out , and finding higher voltage rated parts with the same input specks , and putting a decent heat sink through it , 600volt 10amp IBGT's are cheep , will have to bye one to see inside ? properly MOSFITS in there ?
anyone done this ?

I still havent decided on a plan yet