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-   -   Mission accomplished "license to thrill" (https://www.t-shirtforums.com/diy-dtg/t120740.html)

102557 July 18th, 2010 08:58 AM

Re: Mission accomplished "license to thrill"
 
Quote:

Originally Posted by dragonknight (Post 725954)
Jeff,
I convert an epson printer using conveyor belt design, but the problem is the tighter I setup the belt the epson stock stepper motor can not rotate properly, but if I setup the belt looser my stainless steel shaft does not move at all, do you have this kind of problem with your conveyor belt setup? I am thinking to change my epson stock motor with a bigger one so it can move freely. I try the friction setup everything goes fine :) print perfectly
Thanks

the only issue i had is when i used the first belt material...it had a rubbery stretch to it...

personally i would not change the motor, it has more than enough to move this simple conveyor and is super light weight (less drag than the stock printer)..

you might want to consider using the two small timing belts (with timing belt pulleys) on the orignal 5/16ths shaft in place of the wider conveyor... this system can not be beat in my opinion... (this is how the rainbow textile printer operates there platen transfer system... i did have to adjust my tention with the white belt (window shade) after about 50 prints..no problem since.. but i will be switching both printers to the small timing belt after i tested this setup on the printer it is my conclusion it is the lightest, 100% accurate (due to geared belt and pulley no posibility of mis prints unless you line the shirt crooked on the platen..:D

p.s.. the pf motor is not a stepper motor... it is a dc 42-45 volt motor which uses an encoder...the only stepper motors the epson printers have are the original asf motor (paper feed tray motor) and the pump motor controlled by the firmware;) the pf, carriage motor. apg motors all have a type of encoder scale to control them..

best of luck...

dragonknight July 18th, 2010 10:38 AM

Re: Mission accomplished "license to thrill"
 
Hoho thanks for the advise...I will consider using a small timing belt.

Quote:

Originally Posted by german13 (Post 725969)
the only issue i had is when i used the first belt material...it had a rubbery stretch to it...

Yes this was my current setup and I change again to friction setup and I will try a timing belt setup this time.
Oh btw, Will you still be using your white conveyor belt (windows pulley) for your next setup? I can't find any conveyor belt without rubbery stretch to it except windows pulley :D

102557 July 18th, 2010 11:08 AM

Re: Mission accomplished "license to thrill"
 
Quote:

Originally Posted by dragonknight (Post 726045)
Hoho thanks for the advise...I will consider using a small timing belt.


Yes this was my current setup and I change again to friction setup and I will try a timing belt setup this time.
Oh btw, Will you still be using your white conveyor belt (windows pulley) for your next setup? I can't find any conveyor belt without rubbery stretch to it except windows pulley :D

no im just going to use two 3/8ths inch belts on each side of the platen..

i do have someone sending me a test material aswell, ill see how that works also..

but the timing belts are unbeatable imho...:)

DTFuqua July 18th, 2010 12:09 PM

Re: Mission accomplished "license to thrill"
 
Quote:

Originally Posted by german13 (Post 726066)
no im just going to use two 3/8ths inch belts on each side of the platen.. (like rainbow printer)

i do have someone sending me a test material aswell, ill see how that works also..

but the timing belts are unbeatable imho...:)

How are you going to use the belts? Possibly turn them with the "teeth" facing outward and the smooth side against the drive rod? :rolleyes:

102557 July 18th, 2010 12:17 PM

Re: Mission accomplished "license to thrill"
 
Quote:

Originally Posted by DTFuqua (Post 726091)
How are you going to use the belts? Possibly turn them with the "teeth" facing outward and the smooth side against the drive rod? :rolleyes:

just the opposite..teeth to a teethed pulley on the drive rod.. smooth side the platen rides on..;)

102557 July 18th, 2010 12:37 PM

Re: Mission accomplished "license to thrill"
 
here is where you can get the pulleys and timing belts..;)

Gears Timing Belts Pulleys Shafting Shaft Accessories Bearings Couplings Universal Joints Vibration Mounts Linear Motion Systems Hardware Gearheads Speed Reducers Right Angle Drives Brakes Clutches Motors GearMotors From

DTFuqua July 18th, 2010 03:19 PM

Re: Mission accomplished "license to thrill"
 
It took me a couple of tries to figure it out and still not sure but are the belts in the top rail and the "platen"or t-shirt box has a flange that rides on them? To keep the timing correct for the distance traveled, are they driving against the back/smooth side of them or have they/you figured out a way to compensate for the larger diameter of the gears vs. the diameter of the drive shaft?

102557 July 18th, 2010 03:37 PM

Re: Mission accomplished "license to thrill"
 
Quote:

Originally Posted by DTFuqua (Post 726180)
It took me a couple of tries to figure it out and still not sure but are the belts in the top rail and the "platen"or t-shirt box has a flange that rides on them? To keep the timing correct for the distance traveled, are they driving against the back/smooth side of them or have they/you figured out a way to compensate for the larger diameter of the gears vs. the diameter of the drive shaft?


there is no need to compensate for the bigger pulley added to the shaft... its a one to one ratio...controlled by the encoder;)

we have had several discussions on that topic through out the forums here... and its been proven it works without fault as does mine..

here is a good example check out spiders dtg pg 118 of the built my own for 150 thread..this is a timing belt and pulley system which is clamped to the bottom of the drawer which is on slides..- #1756 (permalink) -

if im not mistaken i think his idler pulley is a bit smaller than the drive pulley, but this is no matter the drive or business end with the encoder controls movement...

think of it this way with the original c88 build which is friction drive...there is just ply wood laying on the drive rod for movement 1 to 1 ratio..it doesnt matter what this thickness is it could be 1/4 inch all the way to 4 inches, essentially this is what it is with the shirt board added three to four inches tall. the shaft size to the encoder wheel is the same size 5/16ths with the r1900.

the movement is controlled by the encoder...;)

hope i explained it well enough

102557 July 18th, 2010 04:02 PM

Re: Mission accomplished "license to thrill"
 
ADDITIONALLY... I just want to be clear, I reference some name brand printers from time to time in the forums, generally because i like a certain aspect of each printer... i think i have made my favorite preferences pretty clear..the mod 1 and the rainbow printer, i hope its taken as a compliment and nothing else thats its intended nature...I am not in anyway copying these designs.. all my designs are my own, and may use similar components (as do most dtgs based on an epson head)but are 100% my own design... I also will not be manufacturering or selling dtg printers.. additionally i use 100% epson firmware for my printer..
the builds i have done are for my own personal use..;):):D

phewwww theres my disclaimer..lol:p

Justin Walker July 18th, 2010 04:21 PM

Ya, you have to be pretty clear on these things, in this industry; people get all up-in-arms over nothing, sometimes! Haha

DTFuqua July 18th, 2010 06:06 PM

Re: Mission accomplished "license to thrill"
 
Quote:

Originally Posted by german13 (Post 726185)
think of it this way with the original c88 build which is friction drive...there is just ply wood laying on the drive rod for movement 1 to 1 ratio..it doesnt matter what this thickness is it could be 1/4 inch all the way to 4 inches, essentially this is what it is with the shirt board added three to four inches tall. the shaft size to the encoder wheel is the same size 5/16ths with the r1900.

the movement is controlled by the encoder...;)

hope i explained it well enough

Sorry but Im kinda dense. OK. The shaft which in the printer is the drive surface for the paper is 5/16 with a circumference of almost an inch meaning for every revolution it moves either the paper or platen almost 1 inch. Now the diameter of the belt drive gear is larger than 5/16 there making the drive surface (circumference) more (don't know the diameter of the gear) than the almost 1 inch of the 5/16 shaft circumference meaning the drive surface which would be the outside circumference of the larger gear will move farther per a single revolution than the smaller diameter shaft.:D It doesn't sound like I'm explaining myself right here but maybe you can get my direction.

102557 July 18th, 2010 06:22 PM

Re: Mission accomplished "license to thrill"
 
Quote:

Originally Posted by DTFuqua (Post 726267)
Sorry but Im kinda dense. OK. The shaft which in the printer is the drive surface for the paper is 5/16 with a circumference of almost an inch meaning for every revolution it moves either the paper or platen almost 1 inch. Now the diameter of the belt drive gear is larger than 5/16 there making the drive surface (circumference) more (don't know the diameter of the gear) than the almost 1 inch of the 5/16 shaft circumference :D It doesn't sound like I'm explaining myself right here but maybe you can get my direction.


It will travel at the same rate or distance with the bigger pulley..its one to one ratio...;)

ok lets say you have a half inch piece of ply wood laying on the drive rod...(c88 build) so its 1/2 larger than the 5/16th rod..it has no change in print speed or distance traveled.. so consider this pulley the additional 1/2 plywood,

in addition you are not taking into consideration the additional height of the shirt board-platen which normally = 3-4 inches additional height off the drive rod, so really the height is about five inches some more some less..for example my printer has a drive belt around the drive shaft and has an additional platen height of 3 1/4 inches, it will travel the same as intended..so essentially the 1/4 higher pulley is the same thing it just does a loop;) its one to one ratio.. the encoder controls distance traveled...

dont know how else to explain it..

hope it helps

dragonknight July 18th, 2010 07:16 PM

Re: Mission accomplished "license to thrill"
 
I see I forgot the spiderx1 post, by using that way I have to do a rewiring (extending the motor wires) to be place on the far back side of the printer, Am I right?

102557 July 18th, 2010 07:57 PM

Re: Mission accomplished "license to thrill"
 
Quote:

Originally Posted by dragonknight (Post 726317)
I see I forgot the spiderx1 post, by using that way I have to do a rewiring (extending the motor wires) to be place on the far back side of the printer, Am I right?

it depends on your design..most likely yes..

my encoder-pf motor is on the front axel..so i have about a 1 foot extention...;) but you can run the pf motor center of the conveyor at a lower elevation say 2 to 3 inches down-but not as much of the belt touches the pulley that way..with the drive motor on either end you get about 75% contact between pully and belt and about 50% with the drive motor in the middle..i prefer the end for the drive motor myself..

DTFuqua July 19th, 2010 05:18 AM

Re: Mission accomplished "license to thrill"
 
Quote:

Originally Posted by german13 (Post 726279)
It will travel at the same rate or distance with the bigger pulley..its one to one ratio...;)

ok lets say you have a half inch piece of ply wood laying on the drive rod...(c88 build) so its 1/2 larger than the 5/16th rod..it has no change in print speed or distance traveled.. so consider this pulley the additional 1/2 plywood,in addition you are not taking into consideration the additional height of the shirt board-platen which normally = 3-4 inches additional height off the drive rod, so really the height is about five inches some more some less..for example my printer has a drive belt around the drive shaft and has an additional platen height of 3 1/4 inches, it will travel the same as intended..so essentially the 1/4 higher pulley is the same thing it just does a loop;) its one to one ratio.. the encoder controls distance traveled...

dont know how else to explain it..

hope it helps

I thought the encoder used is for counting revolutions and is accepting that the drive surfase has a given circumference to determine the distance traveled.
But it is the surface of the shaft, not what ever is on top of it that determines the distance traveled, not the height of whatever it drives. Its like putting monster tires on a truck after running regular sized tires. The distance traveled will be farther for one revolution of the monster tire than the distance traveled for one revolution of the smaller tire. I will have to wait and see how it goes for you.:D I'm still kinda hardheaded I recon.
Terry


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