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  #391  
Old Fri 02 November 2012, 12:37
danilom
Just call me: Danilo #64
 
Novi Sad
Serbia
You used motor plate for XY motors in your model, the Z axis motor plate has different mount points
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  #392  
Old Fri 02 November 2012, 12:45
Hardouin
Just call me: Hardouin
 
Douarnenez
France
Yes, I used the design proposed in the dxf file of rischoof : http://www.mechmate.com/forums/showt...&postcount=385

He didn't design the Z axis copatible plate so I do it.

But do you think this reduction box is a good choice ?


Hardouin
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  #393  
Old Fri 02 November 2012, 12:46
danilom
Just call me: Danilo #64
 
Novi Sad
Serbia
its ok but you should try to make mount flanges like in Z motor plate for proper spring tension on the rack
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  #394  
Old Sat 03 November 2012, 10:35
Hardouin
Just call me: Hardouin
 
Douarnenez
France
Hello !

I drew the large plate for the Z axis.

The result in 3D software :






Here is the dxf file :

motorplateZ.dxf

It looks working well but it's the first time I make dxf (I am beekeeper and carpenter !) so if someone could check it it would be great !


Hardouin


PS :

3D sketchup models for the two gearbox are here :

reductionXY.skp

reductionZ.skp
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  #395  
Old Sat 03 November 2012, 10:41
danilom
Just call me: Danilo #64
 
Novi Sad
Serbia
that's it.... keep up the good work!
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  #396  
Old Sat 03 November 2012, 12:31
Hardouin
Just call me: Hardouin
 
Douarnenez
France
Hello !


I have just discovered the belt reduction made by surfcnc :

http://www.mechmate.com/forums/showt...&postcount=852

Is it a better design ?

What is the better ratio : 1:3 or 1:4 ?

Help me !


Hardouin
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  #397  
Old Sat 03 November 2012, 15:31
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
Ideal resolution for a MM is anywhere between 3:1 to 4:1 for a good compromise between speed, resolution and backlash if you go with Belt Drive transmission.

Gearbox I have found 7.2:1 is perfect on the 4 machines I have been part of fabricating.
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  #398  
Old Sat 03 November 2012, 15:40
danilom
Just call me: Danilo #64
 
Novi Sad
Serbia
its very nice and practical to keep the dust out of belts as my friend Vlada did

here is the picture from his thread

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  #399  
Old Sat 03 November 2012, 21:26
rischoof
Just call me: Rik #92
 
Goirle
Netherlands
Hardouin,

Nice 3d drawing for a bee keeper and carpenter.
for the reduction: I choice 1:3 because the size of the timing belt pulley. If you build 1:4 the contact area from the belt on the small pulley is going to be very small and the chance the belt is moving over the pulley is going to be bigger.

the 1:3 gearbox practically. With the motor's I have, voltage I choose and way of connecting my stepper motors, the 1:3 gearbox has enough torque for working en my corners are smooth without visible chatter.

Also a point what I want to say, when I run in the end-stops, or the machine is touching something and blocked, what do you except what's happening?
broken parts, by the huge amount of torque, breakers which are tripping by getting overpowered ?
I my case, my motor start stolling, and I activate the emergency switch.
after I start up again. everything still works fine.
That's the balance you need to find!
When I activate my limit switch by moving to far on a axis, I can replace my sensor cable by a dummy connector which has a switch to give the correct signal. After I move away my axis to a save position I have to remove the dummy and place the original cable back, when I forget this, next time I run in the hard end stops. And Yes this happened two times

Keeping dust out of the gearboxes is a good Idea. I was planning to make some nice covers when the machine was working. So I will make some covers from mdf with the mechmate which are fitting over the distance bushes. When a cover is mounted, I should inspect them regular. I once damaged my planer belt because particles could not get out by the cover. after this, I made a hole in the underside of the cover

During the last couple of years I read this forum, I didn't see complains about lack of power (torque) on there mechmates
People have more problems getting the gears and pulley's fixed on the axis.
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  #400  
Old Sun 13 January 2013, 16:42
jeep534
Just call me: archie
 
prichard, wv
United States of America
Jr's belt drive design

I have spent quite a bit of time searching and reading is a dfx of jr's belt drives available somewhere. I have plans and I am getting ready to start finally I am planning to use it as a plasma cutter.
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  #401  
Old Sun 13 January 2013, 18:07
MetalHead
Just call me: Mike
 
Columbiana AL
United States of America
I have these sets. They work the geared motor plates

http://www.cvsupply.com/servlet/the-...-Plates/Detail

Will support up to 4:1

I also have belt and pulley setups available for 3.3:1
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  #402  
Old Mon 14 January 2013, 08:47
danilom
Just call me: Danilo #64
 
Novi Sad
Serbia
Jeep if you need JR's drawings I received them from him during my build. PM me your email of you want them.

Mike's are easier to assemble that's for sure. So consider them too.
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  #403  
Old Tue 15 January 2013, 06:01
mrakoplas
Just call me: martin
 
praha
Czech Republic
Hi, I did use this design also for the Z axis. It does work only if you attach the spider to the first slot. You can see it here http://www.mechmate.com/forums/showt...t=czech&page=2.
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  #404  
Old Sun 17 March 2013, 17:21
Tom Ayres
Just call me: Tom #117
 
Bassett (VA)
United States of America
Danilo, I'll take you up on a copy of JR's drawings for eval if you don't mind, thanks
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  #405  
Old Mon 18 March 2013, 03:27
danilom
Just call me: Danilo #64
 
Novi Sad
Serbia
Here they are

https://dl.dropbox.com/u/3884089/Tra...%20To%20Go.zip
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  #406  
Old Mon 18 March 2013, 03:42
Tom Ayres
Just call me: Tom #117
 
Bassett (VA)
United States of America
Thank you very much
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  #407  
Old Thu 07 November 2013, 06:19
Mrayhursh
Just call me: Hurshy
 
Riverview, Florida
United States of America
Professional

Wow, That is a professional doc. Is there a .dxf file? Where are people buying the gears?
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  #408  
Old Thu 07 November 2013, 14:02
danilom
Just call me: Danilo #64
 
Novi Sad
Serbia
sdp-si ?
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  #409  
Old Tue 10 June 2014, 12:15
Chirpenchuck
Just call me: Chirpenchuck
 
Utah
United States of America
So to those who have been using xl belts: After the first installation and tension set on the belts Did you ever REtension/adjust tension on them? Are you constantly chasing a good tension on them? Or did they hold tension over time and never need adjusting after installation?

Thanks.
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  #410  
Old Tue 10 June 2014, 13:38
darren salyer
Just call me: Darren #101
 
Wentzville mo
United States of America
Haven't touched mine since I put it together.
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  #411  
Old Tue 10 June 2014, 17:32
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
I have the oddball xl belt reduction here of single reduction 7.22:1 on three of the axes, a 4:1 single on another plus a 16:1 double reduction on the last and they are still tight.
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  #412  
Old Tue 10 June 2014, 18:43
Chirpenchuck
Just call me: Chirpenchuck
 
Utah
United States of America
Nice, thanks for the info guys.
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  #413  
Old Wed 16 July 2014, 11:33
Chirpenchuck
Just call me: Chirpenchuck
 
Utah
United States of America
So I considered the following but didnt go this route: Someone needs to make an adapter that converts the smaller notched shaft on the geared stepper motor (gearbox removed) up to a .5" shaft for a regular pinion.
This way people could go the regular route of getting geared steppers at first to "cut your teeth" so to speak, Then use the geared steppers to make their own belt drives latter without repurchasing motors.

Like I said, I considered it but didnt do it.

On a separate note I cut steel for the first time yesterday. WHAAA HOOOO! very happy with the results. This was done with my worn out 7.2gearboxes and worn out pinions. I couldnt believe how nice the edge was considering all the wear on the parts. Over 1000hrs on machine and its got some back lash now but holy cow, cutting steel is a huge deal. I dont have any modifications to the gantry or spider (as some claim need to be in place to cut steel...chopper.) Stock Mamba MM with worn out gearboxes and the edge looked laser cut. Needless to say I am ecstatic about it. Gerald I know you have moved on now but I just wanted to thank you again for your efforts in getting the MM out to the people. *thumbsup*

Last edited by Chirpenchuck; Wed 16 July 2014 at 11:41..
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  #414  
Old Wed 16 July 2014, 13:59
Fox
Just call me: Fox
 
Amsterdam
Netherlands
Pics or it did not happen !
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  #415  
Old Wed 16 July 2014, 14:55
rayditutto
Just call me: Robin
 
Victoria
Canada
Send a message via MSN to rayditutto
if i may ask, what were your rpm, feed rate and bit for cutting the steel?
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  #416  
Old Wed 16 July 2014, 16:08
Chirpenchuck
Just call me: Chirpenchuck
 
Utah
United States of America
Oh it happened Ill do more of it on Friday and take pics for you. My phone cant focus that close. Ill have a different camera on Friday and do another cut.
I was running my router speed dialed all the way back. On my router it says thats 10,000rpm Not sure how accurate that is?

Feed: It was my first test and Im sure could be dialed in better but I was at 60ipm with the depth per pass at .005" I added cutting oil to the top surface and a few drops during cutting.

The bit: I really think this was a key factor. It is a 3 flute carbide .25"dia. They have the shallow angle on the flutes. I dont have a link because the bit is used and was given to me. Sorry. Ill take pics of the bit on Friday as well.
Its kinda like this bit at amanatool but I think the flute angle is not that steep.
The bit wasnt even warm to the touch the metal WAS warm to the touch but was not hot. Granted the cut didnt last very long. I was really pleased.
Pics or it didnt happen... I can respect that, this is the internet after all ..
Friday.

Edit: Oh and my bit seems to be darker in color.
Edit again: Its still Wednesday here the forum says its Thursday so .. In a day and a half.

Last edited by Chirpenchuck; Wed 16 July 2014 at 16:36..
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  #417  
Old Thu 17 July 2014, 13:12
Fox
Just call me: Fox
 
Amsterdam
Netherlands
just teasing ya, but looking forward to some eyecandy
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  #418  
Old Fri 18 July 2014, 16:47
Chirpenchuck
Just call me: Chirpenchuck
 
Utah
United States of America
Its time..So I battled software today for some reason. Maybe updates to what I use to make files IDK. I was getting the ends of the arc dont match the start of the arc. Even old files were doing it. Absolute/inc in mach3 With about 60 potential options checked/unchecked anyway... I need to study up on that some more. BUT!!! I did get my first part cut out of steel today!!!!!
Hopefully these pics are to your liking ..











I had some Z/depth problems, the piece was suspended so it was hard to accurate z height, This allowed the part to drop as it approached the thin skin left holding it in place. This left the familiar thin skin that has to be removed. My tabs were to small also. I think what we are most concerned with in this post is the edge quality and IM VERY Happy with the edge. I mean Im going weld it here and there and some sanding will surely come into play at some point. Unsanded the part slips onto that hub nicely and has to go on straight or it binds going on.
Cant wait until I flood the table with coolant and get my belt drives on there.
I did have to babysit this cut and keep adding drops of cutting oil.

Edit:
Also after the cut the bit was barely warm. My motors were warmer, and when I say warm Im talking about not even close to hot but barely noticeable to the touch. It was a little scary at first just thinking the bit was going to shatter or something but Im alive and off to work. The Mechmate is such a monster.

Last edited by Chirpenchuck; Fri 18 July 2014 at 17:12..
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  #419  
Old Fri 18 July 2014, 18:09
Fox
Just call me: Fox
 
Amsterdam
Netherlands
Nice what cut parameters did you use this time ?
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  #420  
Old Fri 18 July 2014, 18:41
IMMark
Just call me: Mark #119
 
Columbus Ohio
United States of America
Wow...very nice and impressive!
Mark
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