Author Topic: MHM platen deflection and other issues  (Read 6781 times)

Offline blue moon

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Re: MHM platen deflection and other issues
« Reply #15 on: August 26, 2014, 11:27:21 AM »

Quote

no rubber on MHM platens. You could put it on aftermarket, but the servos are not designed for the extra weight so I would not.
pierre

I have Rubber tops and love them.. bet the weight of one piece of rubber is not much more that the weight of heavyweight hoody, I doubt this will effect the machine.. on my S Type I can slow down the index speed as well  so there is bit less inertia with the movement.

JMO

did you order it like that?

pierre
Yes, we've won our share of awards, and yes, I've tested stuff and read the scientific papers, but ultimately take everything I say with more than just a grain of salt! So if you are looking for trouble, just do as I say or even better, do something I said years ago!


Offline blue moon

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Re: MHM platen deflection and other issues
« Reply #16 on: August 26, 2014, 11:29:03 AM »
also, our doors are always open. Anybody wanting to see an E-type is more than welcome!

pierre
Yes, we've won our share of awards, and yes, I've tested stuff and read the scientific papers, but ultimately take everything I say with more than just a grain of salt! So if you are looking for trouble, just do as I say or even better, do something I said years ago!

Offline Extreme Screen Prints

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Re: MHM platen deflection and other issues
« Reply #17 on: August 26, 2014, 12:07:27 PM »
We added rubber to our etype 5 year ago, no problems so far. Thinking about adding it to all machines. Detail holds just as good just allows you to use less pressure. Forward printing had the same deflection issues I have noticed. It doesn't affect registration nor does it deflect when printing with plastisol but discharge and waterbase it does deflect. S mesh is cool and all but we stretch in house and use dynamesh and for the cost You can't beat it. We pop 10 screens a week I can't imagine how many LX mesh screens we would pop. Shooting 150 screens a day is just to many to have specialty mesh.

Offline T Shirt Farmer

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Re: MHM platen deflection and other issues
« Reply #18 on: August 26, 2014, 12:22:12 PM »

Quote

no rubber on MHM platens. You could put it on aftermarket, but the servos are not designed for the extra weight so I would not.
pierre

I have Rubber tops and love them.. bet the weight of one piece of rubber is not much more that the weight of heavyweight hoody, I doubt this will effect the machine.. on my S Type I can slow down the index speed as well  so there is bit less inertia with the movement.

JMO

did you order it like that?

pierre

No .. Action rubber top .. around $750 for 12 adult pallets but I covered the entire pallet.. really makes a difference with heat build up. If you order make certain they inspect for wrinkles on the sticky laminated layer.. wrinkles No Bueno!
Robert
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Offline ebscreen

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Re: MHM platen deflection and other issues
« Reply #19 on: August 26, 2014, 12:34:47 PM »
Not challenging Dan's comments but... The squeegee is held by a floating center pin similar top the Javilin so there is no way you can have more treasure on one side of the pallet than the other. In fact having a cylinders with height adjuster( common set up on most machines) is far more likely to have unbalanced squeegee pressure side to side.

We've never had issues with side to side deflection. Front to back, sure, but then so does every machine without cast arms.

Robert, does your S-Type have the little screw adjusters where the squeegees/floods are held? One of my machines does,
and they cause more trouble then they fix. Just float 'em.

Offline ebscreen

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Re: MHM platen deflection and other issues
« Reply #20 on: August 26, 2014, 12:36:55 PM »
And I could be wrong, but I think the E-Types have integral side to side height adjustment, not unlike an M&R machine.

Offline jsheridan

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Re: MHM platen deflection and other issues
« Reply #21 on: August 26, 2014, 12:39:23 PM »
also, our doors are always open. Anybody wanting to see an E-type is more than welcome!

pierre

same out here.

W have a 16 color 4000 and a 14 color Xtreme for show and tell.

Blacktop Graphics Screenprinting and Consulting Services

Offline T Shirt Farmer

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Re: MHM platen deflection and other issues
« Reply #22 on: August 26, 2014, 12:42:50 PM »
Not challenging Dan's comments but... The squeegee is held by a floating center pin similar top the Javilin so there is no way you can have more treasure on one side of the pallet than the other. In fact having a cylinders with height adjuster( common set up on most machines) is far more likely to have unbalanced squeegee pressure side to side.

We've never had issues with side to side deflection. Front to back, sure, but then so does every machine without cast arms.

Robert, does your S-Type have the little screw adjusters where the squeegees/floods are held? One of my machines does,
and they cause more trouble then they fix. Just float 'em.

Yes on the screw limiters.. but mine float
Robert
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Offline T Shirt Farmer

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Re: MHM platen deflection and other issues
« Reply #23 on: August 26, 2014, 12:45:16 PM »
And I could be wrong, but I think the E-Types have integral side to side height adjustment, not unlike an M&R machine.

Spot on Sean... I forgot the print head does have choppers on both sides of squeegee... one more reason to go Stype head.. the more we run this press the more I appreciate what a great machine it is .
Robert
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Offline blue moon

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Re: MHM platen deflection and other issues
« Reply #24 on: August 26, 2014, 01:03:01 PM »
And I could be wrong, but I think the E-Types have integral side to side height adjustment, not unlike an M&R machine.

Spot on Sean... I forgot the print head does have choppers on both sides of squeegee... one more reason to go Stype head.. the more we run this press the more I appreciate what a great machine it is .

I would buy a used E-type, but if buying new, S-Type would be the only option.

pierre
Yes, we've won our share of awards, and yes, I've tested stuff and read the scientific papers, but ultimately take everything I say with more than just a grain of salt! So if you are looking for trouble, just do as I say or even better, do something I said years ago!

Offline Extreme Screen Prints

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Re: MHM platen deflection and other issues
« Reply #25 on: August 26, 2014, 01:09:59 PM »
Honestly I like the Etypes height adjustments vs the Stype or 4000. Mainly because you have more adjustment height and they seem to be built stronger. I have had multiple cylinders go out on my Xtype and 4000 but not one on my etype 5 years later. We beat that press up printing 20x24 inch prints and it just keeps up.

Offline Screened Gear

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Re: MHM platen deflection and other issues
« Reply #26 on: August 26, 2014, 01:52:16 PM »
Honestly I like the Etypes height adjustments vs the Stype or 4000. Mainly because you have more adjustment height and they seem to be built stronger. I have had multiple cylinders go out on my Xtype and 4000 but not one on my etype 5 years later. We beat that press up printing 20x24 inch prints and it just keeps up.

Extreme,

I just realized who you are. You do some videos on Youtube. You have 2 business names on there I think. You have a 6 color etype and print with really large pallets. You do good work. Nice to see you here.

Offline Extreme Screen Prints

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Re: MHM platen deflection and other issues
« Reply #27 on: August 26, 2014, 02:20:45 PM »
Honestly I like the Etypes height adjustments vs the Stype or 4000. Mainly because you have more adjustment height and they seem to be built stronger. I have had multiple cylinders go out on my Xtype and 4000 but not one on my etype 5 years later. We beat that press up printing 20x24 inch prints and it just keeps up.

Extreme,

I just realized who you are. You do some videos on Youtube. You have 2 business names on there I think. You have a 6 color etype and print with really large pallets. You do good work. Nice to see you here.
Thanks Jon, I think our youtube channel name is The Screen House. We have a video on the homepage of our website that shows all 3 mhm presses printing.

Offline Screened Gear

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Re: MHM platen deflection and other issues
« Reply #28 on: August 26, 2014, 02:24:51 PM »
We have a MHM4000 auto reg, the new Xtype and a small Etype. I can say that the only MHM machine that doesn't have drastic pallet deflection is the 4000. Now we all know how terrible pallet deflection is for printing high end process work or waterbase and discharge. I was a MHM loyalist but after looking at an sroque and how there built I would go Sroque unless your going with a 4000. The arms are huge on the Sroque and extend further out. That is the only negative on mhm presses but it is a huge negative that they need to do something about. Now the benefit of the MHM presses is rarely having to take your floods and squeeges out of press. Pop the head up and scrape the ink off and give it a quick wipe and your on to the next color, that alone lets my guys setup a few more jobs per day. I do not post here very often but I would hate to see someone not give Sroque a try just because everyone with MHMs says there comparable to a BMW in car terminology.
I would also like to add, no matter how good you register on the FPU you still have to micro 50% of the heads, if you say you don't then your not printing detailed stuff or you have a huge choke.

try using a 10X magnifying glass to place the films. It just about eliminates the need for registering (8 out of 10 are right on and don't need to be touched). Our standard stroke is 1pt for the spots and everything falls within that jsut fine. On the sim process jobs that are registered within few thousands of an inch, we need to do a little bit more, but not much. . .

what issues are you seeing with deflection? We hold the registration to under 5/1000th and have not had any problems with it. What should I be looking for?
Pierre

I have not seen the deflection affect reg. just causes problems with coverage and having to double stroke on our discharge underbase. We run everything discharge under with plastisol on top and our underbase head has to be at 5 bar. We are running 180-230 mesh 32nm and have to double hit 50% of the time mainly because of deflection. The print will clear at the bottom of the stroke but not the top.  I here you guys talk about points, who sends vector art these days, 99% of the time we are working with crazy bitmap files created in photoshop. I think 1 point = 3 pixels at 300 dpi if i'm not mistaken. If we choke 3 pixels we either lose alot of detail or you can see the color falling off and to me it doesn't look very good.

You know this sounds like your head may not be parallel to the pallet. Have you measured the print carriage to the pallet? Do two measurements one in the front of the pallet and then one on the back of the pallet. Just move the print carriage from from to the back and measure from any point to the pallet. If its off your squeegee will lose "pressure" on the print if it lifts at all. I know it could be deflection too but if this is off it will always be a problem even at low pressure. If your printing with 5 bars that's 72.5 pounds. That's alot. if I was printing discharge that hard it would go all the way though the shirt easy. Most discharge prints (underbases) I use a soft squeegee and print with no more than 3-4 bars. I do print my discharges runny so that maybe the difference. Not saying your doing anything wrong, I know you know what your doing, just wanted to try to help point out a few things that may make your life easier.

Offline Extreme Screen Prints

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Re: MHM platen deflection and other issues
« Reply #29 on: August 26, 2014, 03:03:12 PM »
We have a MHM4000 auto reg, the new Xtype and a small Etype. I can say that the only MHM machine that doesn't have drastic pallet deflection is the 4000. Now we all know how terrible pallet deflection is for printing high end process work or waterbase and discharge. I was a MHM loyalist but after looking at an sroque and how there built I would go Sroque unless your going with a 4000. The arms are huge on the Sroque and extend further out. That is the only negative on mhm presses but it is a huge negative that they need to do something about. Now the benefit of the MHM presses is rarely having to take your floods and squeeges out of press. Pop the head up and scrape the ink off and give it a quick wipe and your on to the next color, that alone lets my guys setup a few more jobs per day. I do not post here very often but I would hate to see someone not give Sroque a try just because everyone with MHMs says there comparable to a BMW in car terminology.
I would also like to add, no matter how good you register on the FPU you still have to micro 50% of the heads, if you say you don't then your not printing detailed stuff or you have a huge choke.

try using a 10X magnifying glass to place the films. It just about eliminates the need for registering (8 out of 10 are right on and don't need to be touched). Our standard stroke is 1pt for the spots and everything falls within that jsut fine. On the sim process jobs that are registered within few thousands of an inch, we need to do a little bit more, but not much. . .

what issues are you seeing with deflection? We hold the registration to under 5/1000th and have not had any problems with it. What should I be looking for?
Pierre

I have not seen the deflection affect reg. just causes problems with coverage and having to double stroke on our discharge underbase. We run everything discharge under with plastisol on top and our underbase head has to be at 5 bar. We are running 180-230 mesh 32nm and have to double hit 50% of the time mainly because of deflection. The print will clear at the bottom of the stroke but not the top.  I here you guys talk about points, who sends vector art these days, 99% of the time we are working with crazy bitmap files created in photoshop. I think 1 point = 3 pixels at 300 dpi if i'm not mistaken. If we choke 3 pixels we either lose alot of detail or you can see the color falling off and to me it doesn't look very good.

You know this sounds like your head may not be parallel to the pallet. Have you measured the print carriage to the pallet? Do two measurements one in the front of the pallet and then one on the back of the pallet. Just move the print carriage from from to the back and measure from any point to the pallet. If its off your squeegee will lose "pressure" on the print if it lifts at all. I know it could be deflection too but if this is off it will always be a problem even at low pressure. If your printing with 5 bars that's 72.5 pounds. That's alot. if I was printing discharge that hard it would go all the way though the shirt easy. Most discharge prints (underbases) I use a soft squeegee and print with no more than 3-4 bars. I do print my discharges runny so that maybe the difference. Not saying your doing anything wrong, I know you know what your doing, just wanted to try to help point out a few things that may make your life easier.
Even with that much pressure we don't print thru the shirt, I think the biggest issue is having to use 200-230 mesh, Discharge doesn't like to go thru that easily. I am pretty sure it's not a head parallel thing because it's in all 3 presses and different heads. I ordered those action double blade squeegees so I will report back how they work. Thanks for the suggestions I will double check the head just to be safe.