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Author Topic: h-bot can mach3 run them?  (Read 5454 times)

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Offline nobby

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h-bot can mach3 run them?
« on: May 11, 2014, 10:12:37 AM »
http://www.youtube.com/watch?v=yZm4TXPPlTo

2 foot square static x and y motored gantry
= no weight and fast
plasma torch height up and down on a cable

can mach run it?

whats the largest belt available
what belts do you use
are the pulleys and idlers available off the shelf

Offline Tweakie.CNC

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Re: h-bot can mach3 run them?
« Reply #1 on: May 11, 2014, 11:51:21 AM »
Hi Nobby,

All the parts (V-Groove, V-Wheels, belts, pulleys etc.) can be obtained here http://openbuildspartstore.com/ - they also have many agents / distributors around the world.

It depends on the accuracy you require (belts will stretch) but the H-Bot idea is interesting.

Mach3 is not designed for the H-Bot type of drive configuration but I am sure some clever person could write a post processor for it  ;)

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline nobby

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Re: h-bot can mach3 run them?
« Reply #2 on: May 11, 2014, 12:08:49 PM »
http://www.ebay.co.uk/itm/HTD-5mm-Pitch-Timing-belt-25mm-width-2525mm-long-505-tooth-CNC-ROBOTICS-/251051514482?pt=UK_BOI_Industrial_Automation_Control_ET&hash=item3a73d61a72

yes 2525 = divided by 6 = 420 square ish
25mm belt

even do it dual shaft motor with dual belt top and bottom dual idler

plasma torch eletro magnet up down or cable pull or twist

plus of course there doesn't seem to be any reason why you couldn't double up the motors and have 4 = one in each corner too.

vroom vroom

so doing the sums in your head 'i can't' IF I were to buy one of thos belts

5mm pitch, 2525mm long with 505 toofs, what diameter drive gear would you suggest?

plus considering its a 500mm square bed and there is no weight bar two 45mm square lengths of t-slot and a plasma torch, could you get away with 4 nemae 17's or would you run with the smallest 23's - but still dual shaft?

p.s. I have a shed - litereally - load of 45mm squar t-slot, so I plan on simply bolting a square together, then bolting on some t-slot thk rail 'maybe top and bottom see!!! - with a simple triangle on two block bearings with a spacer on the y the width of the bearing, twin tubes for y axis with a left and righty for a turn buckle effect for tensioning at each end.

plus of coure in the table corners its simple triangles with fout holes for the motor mounts and a cebntred hole for the shaft, poulley on top, enclose the motors
wireing going through the t-slot, like majic.

plus the y-axis triangle hold the idlers.

i think i need to buy some bits, anyone got 4 thk rails and 8 bearing blocks and 4 dual shaft motors, 2 2525 belts , 4 idlers etc etc



« Last Edit: May 11, 2014, 12:17:29 PM by nobby »

Offline Mogal

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Re: h-bot can mach3 run them?
« Reply #3 on: May 11, 2014, 12:37:32 PM »
I'd like to advise against the HBot design, and proceed with a "CoreXY" insted.

The nature of the HBOT introduces racking. The CoreXY utilizes a cross over belt
that will counter act the racking forces.

http://corexy.com/


I do know that people have gotten 3D printers working with mach3 (using the HBot and CoreXY setup)
http://cnc2printer3d.wordpress.com/software/
http://forums.reprap.org/list.php?264

I haven't looked, but like Tweakie said, I'm sure somebody out there has already done it  ;)

Offline nobby

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Re: h-bot can mach3 run them?
« Reply #4 on: May 13, 2014, 11:34:43 AM »


can I run it with 4 motors
2 each side and simply wire them together
thats to scale with a 2525mm belt
45mm box aluminium extrusion
20mm rails 450mm long ish

should I go nema 17 or stick with small 23's
should I get the 25mm wide belt simply beacause I can
what teeth coun't would you suggest at 5mm pitch
do the idler wheels/pulleys need to be the same size as the motor gear

thanks

« Last Edit: May 13, 2014, 11:38:26 AM by nobby »

Offline Tweakie.CNC

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Re: h-bot can mach3 run them?
« Reply #5 on: May 14, 2014, 03:12:09 AM »
Quote
can I run it with 4 motors 2 each side and simply wire them together

In the good old days when stepper motors were only operated in whole steps it was common to see two or more steppers wired together (either series or parallel) and driven by one controller chip.

Since the introduction of micro-stepping, modern stepper controllers are 'smart' and use emf feedback to control motor windings current when holding position – connecting two motors to one controller chip confuses the logic and it is now regarded as bad practice.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline nobby

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Re: h-bot can mach3 run them?
« Reply #6 on: May 18, 2014, 01:48:42 PM »
well I went with
1. XL 20 Teeth Aluminum Timing Belt Pulley 6.35mm Bore 2 Flanges 5.08mm Tooth Pitch - 4 each corner
http://www.ebay.co.uk/itm/281323015172?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
2. NEMA 23 Stepper Motor 5.5Kgcm 1.8Degre 4Leads 41mm 57BYGH41-401B
http://www.ebay.co.uk/itm/251316972267?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
3. TB6560 3A Stepper Motor Drivers DC24V 3.5A Driver Board Router Single Controller - two of these
http://www.ebay.co.uk/itm/291102041810?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
4. HTD (5mm Pitch) Timing belt (9mm width) 1240mn to 2525mm long CNC/ROBOTICS
http://www.ebay.co.uk/itm/251281595714?var=550245844868&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

made a boo-boo buying these x4 thinking I was going to use the nema 17's with the 5mm shafts!!! = damn
then equall messed up again buying 4 of these
http://www.ebay.co.uk/itm/121159790132?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
thinking I was going to use an 8mm shafted nema 23, but they were all a bit too big!!!


going to buy a 24v psu, this one
http://www.ebay.co.uk/itm/251323107133?ssPageName=STRK:MEBOFFX:IT&_trksid=p3984.m1427.l2649

and a 50khz usb bob, one of these to try......do I need 200khz?
http://www.ebay.co.uk/itm/5-Axis-USB-Mach3-Controller-Card-50KHz-CNC-Breakout-Interface-Board-Win7-8-XP-2K-/251492008098?pt=UK_BOI_Industrial_Automation_Control_ET&hash=item3a8e1780a2


so do you think thats all okay?
will only be pulling around one of these
http://www.ebay.co.uk/itm/WSD-60P-Air-Plasma-Cutter-Plasma-Cutting-Parts-Torch-Body-Torch-Head-Pilot-Arc-/251467476174?pt=LH_DefaultDomain_3&hash=item3a8ca12cce

oh just need some 20 or 25mm rails and bearings  - 4 and 8 blocks about 450mm long
« Last Edit: May 18, 2014, 01:53:29 PM by nobby »

Offline nobby

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Re: h-bot can mach3 run them?
« Reply #8 on: May 20, 2014, 09:43:44 AM »
http://www.gatesmectrol.com/mectrol/brochure.cfm?brochure=3143&location_id=5314

check tooth pitch!!! do no assume!!!

great so should have bought 9mm htd pulleys 5mm pitch,
bugger, none of the pulleys I have bought = 12 in total are any good
ha ha ha
« Last Edit: May 20, 2014, 09:51:49 AM by nobby »