Yes Gerald , Bakra means only a goat, But in this case if irfan does a mistake it will sacrifisied @ the cost of 2 Goats Approx $100 i think.

Vishnu

i thank all the people around the globe who shared grief & pity to the people who withered away in Mumbai. We may all wish to have a peaceful world for our future generation free of terror.

Motors turning
 

:)

folks today almost finished all the wiring and then powered up a drive - now the stepper motor turns well.

havent set up exact steps per rev etc., will do that on the machine - but as of now things look very good on the control box. estop works.

The following was done today

1. The three computers - machine 1, machine2 and laptop were networked.
2. Mini IO xml shared from the small mc
3. Mach lockdown version installed on the mechmate computer.
4. Finalised wiring of the controller
5. Chkd for estop (24V estop working)
6. connected relays which short the caps to a 7ohm 25 watts wire wound resistor.

Things to do

1. Chk all motors running - have to read more here
2. Tune the motors - have to read more
3. have to interface the e stop using optos to the BOB.
and so much more to do............

I have a question folks

I have 4 motors out of which 3 are 630OZ and one is 450OZ,

I am planning to use the 630 ones on the long and Z axis and use the 450 on the short axis.

is that the right thing to do?

I will be having 1:3 JR type reductions on all four.

Need your help on finalising this.

http://www.youtube.com/watch?v=i1Jved539G8

the video of the motor turning

Folks thats all for today

I should say the Atom is a nice processor MB combo.

RGDS
IRfan

I would use the "weak" motor on the short vertical Z-axis.

G' should not the title of this thread change to something better? :)

G' the logic behind me not planning to use the weak motor on the Z was that when doing 3d stuff we need more accln and speed on the Z which the weak motor may fail to provide.

where as the shorter axis most of the time has a linear speed movement and that why use the weaker motor on the short axis.

RGDS
Irfan

The z is the lowest mass axis and needs less torque to achieve the same acceleration.

Okay, you give me a thread title - it is YOUR thread! :D

Motors moving - waiting to compare the ballscrew servo and the mechmae stepper machine !

Well done Irfan! I am falling behind again.

HI folks, I ordered the Asian spindle today.

cost being 261 USD + shipping - Vishnu also ordered the motors from Deitec, cost was 52USD for 580 OZ motors - we are using a 1:3 reduction - so I think will be sufficient.

the advantage of buying it from deitec was that they are located in Hong Kong and UPS is real cheap than from interior China.

RGDS
IRfan

Congrats Irfan. I'm anxious to see some pictures of your new parts.

Congrats, Irfan. Let us know how the Chinese Spindle comes along.

Can you give us the info of the Spindle specs, and the website of Deitec so I can inquire as well from them for my prospective use?

Thanks,
WT

Irfan & me both of us have ordered spindles and i have ordered steppers also. please wait for a week so that we can tell u the quality so our folks can proceed further.

Vishnu

Hi Irfan & Vishnu, did you guys ever give us a link to Deitec?

Its here G' http://www.mechmate.com/forums/showthread.php?t=1196

website is www.driver-motor.com

Some Closeups Of Spindleand Vishnus Steeper Moters
 

hI,
these are some of the pictures which vishnu sent me earlier.i still havent physically touched the spindle yet.

i have a concerns about the motors we ordered for vishnu.these motors are
8 wire motors rated at 5 amps we need help in wiring this to the gecko 203 drive, should we do it half coil or full.this is a bit confusing for us.

RGDS
IRFAN

The starting point for wiring those motors is to know the coil inductances. A spec sheet will tell all.

product pics and vfd.
 

some pics of the work done on my smaller router.

this is a book rack designed by me - :)

how I hope the mehmate was working - first I had to cut the 3x8 sheets to the required sizes and then load them on the machine - for the longer parts had to split the toolpath into 2.

also the Delta VFD arrived today - the application engineer here is so friendly and promised to come and help me in my installation.

RGDS
Irfan

Irfan I need that guy's name so I could ask if he will come and help me install one. :D I like your book case.

Delta VFD's are fun . . . . . I have gotten 3 different models to drive spindles already. JR, can I come and help you? :D

Nice "technical" bookcase!

JR, I called up the AE ' he's ready to come - and has a visa ready - he's just waiting for you to send the flight tickets :D

G' I havent got any experience with the VFD, if that front panel removable and can it be placed where comfortable right - anyways I will also look into the manual.

RGDS
IRfan

. . . . . if you purchased the ribbon cable

Normally you would only use the little panel to start / stop the spindle and set its speed, but we start/stop it with the PMDX122 and put another speed control potentiometer on the control box.

Gerald I have 2 spare bedrooms. If you would like a holiday to southeastern North Carolina, come on down or rather up.
Irfan Gerald's offer didn't mention flight tickets so I had to go with him, sorry :rolleyes::D ................. I wonder how much Gerald eats in a week.

G' I was searching for a reactor for the spindle and VFD, they only provided me with one which I can use between the Power supply and VFD and not the one between the VFD and spindle - will this work for us?

RGDS
IRfan

I know too little about reactors to make a guess on this one. :(

ok - the supplier assured me that I would be OK - so I am going ahead to use the one provided. will let everyone know if any problem arises.

RGDS
IRfan

gearbox comments welcome :
 

Folks - here is my design of the gear box - comments are welcome - especially those finding teh faults in the design.

RGDS
IRfan

forgot the pinion shaft
 

shaft added

the pinion shaft is 10mm dia.

Be sure to allow for adjustment. Normally the motor slides at least 6mm to compensate for differences in the belt and to allow the belt to be replaced.

Irfan,

I noticed that the belt in your drawing doesn't show teeth. Is it a toothed belt?

If yes, I have read (I don't know where) that a good quality toothed belt and gear system (often called a timing belt and timing pulley) has very little backlash, even less than gear-to-gear system.

Is that your understanding?

Regards,
John

Mike I modified the mount per your advise.

John you are right on every count :)

i am thinking of material that can be used for this, I have seen Acrylic and Aluminum used so far, will delrin / ABS / PVC - can any of these be used? considering I am not tapping threads in them?

RGDS
Irfan

I built one set of belt drive gearboxes from 1/2-inch polycarbonate, another set from 1/2-inch aluminum, and the final set from 1/2-inch Delrin. All three materials worked equally well. If I were to build another set, I would probably use Delrin, but I would use metal for the motor mount to help dissipate the heat better. One other thing that I would definitely do next time would be to cut the two main plate from 1/2-inch MDF until I was satisfied with the design. Looking through my drawings shows fourteen different versions, about half of which were actually cut. The only reason that I used 1/2-inch thick material was to allow the brackets to be pocketed for ball bearings. It would be much more time/cost effective to have the brackets laser cut out of 3/16-inch steel and then either use bronze bushings for bearings or cut some bearing blocks out of 1/2-inch aluminum or Delrin. (Even when jogging at 15-ips with a 1-1/2 inch diameter pinion gear, the shaft is only turning 200 RPM, so I doubt whether it's necessary to use ball bearings. Except of the mess of occasionally oiling bronze bushings, they would probably be satisfactory.)

(On my designs, I also slotted the hole for the shaft and the shaft slot was large enough so that I could remove the motor without taking the gear off the shaft.)

Mile I took care of the words in the brackets,

folks teh pics are in no particular order - found out that I had made a few mistakes and I am still finding out and working my way through :)

RGDS
Irfan

Irfan,

Nice progress. Thanks for sharing. It's good to see some step-by-step pictures of a build.

I notice that the "bevels" are not yet on the Y-rails. Yet they are cut to length. Are you going to mill them?

Regards,
John

:)

I mentioned that I erred in a lot of places - congrats John - you caught one :)

I am going to weld a extra piece of flat and then grind it.

not the right way - but just a improvisation.

Hey Vishnu are u listening mate - I need that attachment to grind the rails - send it to me fast :):rolleyes:

RGDS
Irfan

Nice progress Irfan!

Want to choose a new title for your thread? :)

This time your choice G' :)

RGDS
IRfan

Hi,

I'm busy looking at a 3:1 gearbox and like u'r design. Could u make the design avaiable. I'm using SolidWorks 2006.

Rgds

John

John - once the design works - I will share the IGES files.

well - the control box went one step ahead now - you can see the pics attached

From going to Coimbatore to visit Vishnu - I picked up the spindle and tomorrow will be off to purchase the tube - pump and radiator -

need to get some U clamps to mount the spindle on the Z plate.

Vishnu has given me some Z components and I will start working on it once everything is going in my hand.

vishnu has not yet completed the rail grinding and so I could not get his attachment.

One another thing Vishnu did not mention is the screw up the CNC guy has done to the V wheels - Instead of the advised 90 deg the wheels measured 70 deg which is a tad deeper and so we are back to sq one on wheels - we have asked for replacements.

Gear box material was purchased by Vishnu so even that is coming from him -

till then i have to mount bellows on my Ball screw machine which I will finish and also the cooling part - for the spindle for the mechmate.

RGDS
IRfan