UL-25E "surplus" Laser Engraver rebuild

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Re: UL-25E "surplus" Laser Engraver rebuild

Postby lasersafe1 » Sun Jan 31, 2010 9:10 pm

Y stage mirror mount details

Here are some details about the Y stage mirror mount. The mount is well designed and uses a method called the "flexure" mount. The flexure mount is nice because it is machined from one solid block of metal. The thinner section of metal allows the mirror section to be slightly adjusted as the metal "flexes". The flex allows pure X plane motion without any twisting that could cause a Y plane motion.

Attachments
DSC01946.JPG
Y stage flexure mount top view with mirror
DSC01946.JPG (51.21 KiB) Viewed 4174 times
DSC01945.JPG
Y stage flexure mount top view without mirror
DSC01945.JPG (50.72 KiB) Viewed 4169 times
DSC01944.JPG
Y stage flexure mount orthoganal view
DSC01944.JPG (54.32 KiB) Viewed 4172 times
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Re: UL-25E "surplus" Laser Engraver rebuild

Postby lasersafe1 » Sun Jan 31, 2010 9:28 pm

X sweep mirror and lens mount detail

Attachments
DSC01948.JPG
The X stage (sweep) mirror and lens assembly (mirror and lens removed)
DSC01948.JPG (56.59 KiB) Viewed 4188 times
DSC01943.JPG
The X stage (sweep) mirror and lens assembly (mirror and lens removed) (plan view)
DSC01943.JPG (58.29 KiB) Viewed 4189 times
DSC01942.JPG
The X stage (sweep) mirror and lens assembly (mirror and lens removed)
DSC01942.JPG (60.07 KiB) Viewed 4178 times
DSC01941.JPG
The X stage (sweep) mirror and lens assembly (mirror and lens in place)
DSC01941.JPG (57.96 KiB) Viewed 4170 times
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Re: UL-25E "surplus" Laser Engraver rebuild

Postby lasersafe1 » Sun Jan 31, 2010 9:39 pm

X sweep motor. You're not going to belive this!


Attachments
DSC01949.JPG
NEMA 17 .375" thick pancake stepper motor
DSC01949.JPG (66.89 KiB) Viewed 4187 times
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Re: UL-25E "surplus" Laser Engraver rebuild

Postby lasersafe1 » Sun Jan 31, 2010 9:52 pm

ULS25 Air Flow Plenum description

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Re: UL-25E "surplus" Laser Engraver rebuild

Postby lasersafe1 » Mon Feb 01, 2010 1:12 am

XY rails removed for closer inspection

Attachments
DSC01976.JPG
Flexure mount. Screws marked with green adjust the flex of the mirror assembly. The screw marked with red adjusts the X belt tension
DSC01976.JPG (72.26 KiB) Viewed 4200 times
DSC01975.JPG
Y mirror Flexure mount. The item with green dots is one solid machined item that can flex for mirror adjustment in the x plane
DSC01975.JPG (75.33 KiB) Viewed 4195 times
DSC01972.JPG
lens holder shown when it engages the optical interrupt sensor for home position
DSC01972.JPG (57.86 KiB) Viewed 4199 times
DSC01971.JPG
Underside of X mirror/lens assembly
DSC01971.JPG (60.4 KiB) Viewed 4195 times
DSC01969.JPG
opposite Y carriage with tensioner screws
DSC01969.JPG (56.11 KiB) Viewed 4188 times
DSC01968.JPG
picture of entire side belt
DSC01968.JPG (64.79 KiB) Viewed 4180 times
DSC01966.JPG
Another view of the belt tensioner. One of two on the Y axis timing belts.
DSC01966.JPG (61.86 KiB) Viewed 4182 times
DSC01967.JPG
underside of X drive motor assembly showing wheels engaged in the groove
DSC01967.JPG (63.03 KiB) Viewed 4171 times
DSC01962.JPG
Y stage drive motor. 2 amps. 0.9 deg/step NEMA17
DSC01962.JPG (59.92 KiB) Viewed 4178 times
DSC01958.JPG
The dual shaft NEMA17 motor driving the two Y stage timing belts
DSC01958.JPG (56.36 KiB) Viewed 4177 times
DSC01965.JPG
Side view of belt tensioner on Y axis.
DSC01965.JPG (60.39 KiB) Viewed 4171 times
DSC01964.JPG
Top view of belt tensioner assembly on Y axis
DSC01964.JPG (55.39 KiB) Viewed 4171 times
DSC01963.JPG
Entire XY rail assembly removed from enclosure
DSC01963.JPG (60.72 KiB) Viewed 4174 times
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Re: UL-25E "surplus" Laser Engraver rebuild

Postby lasersafe1 » Mon Feb 01, 2010 1:22 am

First corner lens detail

As I mentioned in an earlier post, the first corner lens is mounted in a box behind the engraving area. Neither it nor the laser will see the air environment of the cutting area because the laser passes through a window to the cutting area. The details of the following images should give you an idea of the adjustment capability.
Attachments
DSC01957.JPG
DSC01957.JPG (53.94 KiB) Viewed 4199 times
DSC01956.JPG
DSC01956.JPG (49.64 KiB) Viewed 4185 times
DSC01955.JPG
DSC01955.JPG (52.77 KiB) Viewed 4187 times
DSC01954.JPG
DSC01954.JPG (52.92 KiB) Viewed 4190 times
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Re: UL-25E "surplus" Laser Engraver rebuild

Postby lasersafe1 » Mon Feb 01, 2010 1:24 am

Z-lift assembly

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Re: UL-25E "surplus" Laser Engraver rebuild

Postby lasersafe1 » Mon Feb 01, 2010 2:57 pm

Flying mirror assembly after cleanup

Here is where we get the answer to that nagging question. The flying mass is 3.5 ounces. To this I guess you would consider the belt and belt friction to be another item to add to the total mass, but this is still very light indeed.

The wheels are made from a very hard plastic and they do contain small roller bearings. The drive belt tensioner and belt clamps are a pretty slick design.
Attachments
DSC01980.JPG
DSC01980.JPG (53.69 KiB) Viewed 4171 times
DSC01979.JPG
DSC01979.JPG (56.39 KiB) Viewed 4177 times
DSC01978.JPG
DSC01978.JPG (53.04 KiB) Viewed 4159 times
lasersafe1
 
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Re: UL-25E "surplus" Laser Engraver rebuild

Postby bdring » Mon Feb 01, 2010 4:05 pm

What are the little cylindrical looking things in the middle of the flying mirror assembly? They look like little roller bearings
.
cyls.JPG
cyls.JPG (19.65 KiB) Viewed 4156 times
Bart
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Re: UL-25E "surplus" Laser Engraver rebuild

Postby buildsomething » Mon Feb 01, 2010 4:52 pm

Those little rollers are used to create a radius for the timing belt to wrap around without causing any stress concentrations and causing the belt to fail during repetitive operations. Not sure if the rollers can be adjusted since that would be a nice way to provide some belt tension as well.

You can see this in one of the pictures posted below.

Richard
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