Search found 2488 matches

by mawyatt
Wed Jul 08, 2020 6:57 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: When DMAP and stereos shine! New pics added.
Replies: 14
Views: 2603

Re: When DMAP and stereos shine! New pics added.

Nice work, really like the stereo view. Agree it just "jumps" out to show the 3D effect.

Is that a Wemacro lens holder on the "tube lens" which looks like a Nikon 200mm F3.5?

Best,
by mawyatt
Tue Jul 07, 2020 2:36 pm
Forum: Equipment Discussions
Topic: Linear stage with 3.3" travel, stepper motor, and 0.5 micron encoder for about $100
Replies: 17
Views: 2856

Re: Linear stage with 3.3" travel, stepper motor, and 0.5 micron encoder for about $100

We have traveled rather far from the hardware at hand, and I don't want to mislead those potentially interested. The encoder on this hardware is linear, high resolution and appropriate for the majority of photomacrography purposes (>3" travel and practical resolution around 1um which should be suff...
by mawyatt
Tue Jul 07, 2020 10:56 am
Forum: Equipment Discussions
Topic: Linear stage with 3.3" travel, stepper motor, and 0.5 micron encoder for about $100
Replies: 17
Views: 2856

Re: Linear stage with 3.3" travel, stepper motor, and 0.5 micron encoder for about $100

I think in the sub µm range the problem is no longer the motor but stick-slip phenomena of the spindel/nut. May be the ball screw of the THK KR series has an edge over all the thread screw spindels. But probably such small movements with high accuracy and repeatability are the domain of piezo posit...
by mawyatt
Tue Jul 07, 2020 6:13 am
Forum: Equipment Discussions
Topic: Trinamic parameter tuning
Replies: 5
Views: 1432

Re: Trinamic parameter tuning

Can the Stallguard value be found by starting low so that the motor stalls and then increasing the vale until it moves? I think I've found that the behaviour is different depending on whether you are going clockwise or anticlockwise! I've noticed this too, one direction runs slightly slower than th...
by mawyatt
Sun Jul 05, 2020 11:11 am
Forum: Equipment Discussions
Topic: Linear stage with 3.3" travel, stepper motor, and 0.5 micron encoder for about $100
Replies: 17
Views: 2856

Re: Linear stage with 3.3" travel, stepper motor, and 0.5 micron encoder for about $100

We don't use the Toshiba devices but was told about them, were using some of the TI devices which were all replaced. Feedback doesn't "cure" backlash, it only masks the effects, sometimes making it worse. The dead zone caused by backlash creates "hunting" in closed loop systems, this can cause consi...
by mawyatt
Sun Jul 05, 2020 10:13 am
Forum: Equipment Discussions
Topic: Trinamic parameter tuning
Replies: 5
Views: 1432

Re: Trinamic parameter tuning

Can the Stallguard value be found by starting low so that the motor stalls and then increasing the vale until it moves? I think I've found that the behaviour is different depending on whether you are going clockwise or anticlockwise! Don't know, probably best to study the Trinamic documentation. We...
by mawyatt
Fri Jul 03, 2020 3:05 pm
Forum: Equipment Discussions
Topic: Trinamic parameter tuning
Replies: 5
Views: 1432

Re: Trinamic parameter tuning

Andy, We've not used the Trinamic Test boards, but found that having an accurate view of the motor Sine and Cosine current waveforms valuable in setting the controller parameters for the TMC 5072, 5130 and 5160 Trinamic devices and various stepper motors and focus rails. To view the motor currents y...
by mawyatt
Thu Jul 02, 2020 11:21 am
Forum: Equipment Discussions
Topic: Test wafer distribution: Many features, includes res chart
Replies: 80
Views: 15713

Re: Test wafer distribution: Many features, includes res chart

My envelope has the same smudge markings as Rik's. Agree this is probably from an automatic sorter or reader.

Best,
by mawyatt
Wed Jul 01, 2020 6:38 pm
Forum: Equipment Discussions
Topic: Test wafer distribution: Many features, includes res chart
Replies: 80
Views: 15713

Re: Test wafer distribution: Many features, includes res chart

Mine didn't survive either, broken into about 20 pieces.

Best,
by mawyatt
Wed Jul 01, 2020 6:17 pm
Forum: Equipment Discussions
Topic: Linear stage with 3.3" travel, stepper motor, and 0.5 micron encoder for about $100
Replies: 17
Views: 2856

Re: Linear stage with 3.3" travel, stepper motor, and 0.5 micron encoder for about $100

The THK KR types we have show no measurable backlash. A test awhile back at an effective magnification of 800X showed no signs of backlash nor serious induced vibration, suspect the Parker rails would also be good. Too many projects keep me from evaluating these rails with the Trinamic controller th...
by mawyatt
Wed Jul 01, 2020 10:25 am
Forum: Equipment Discussions
Topic: Linear stage with 3.3" travel, stepper motor, and 0.5 micron encoder for about $100
Replies: 17
Views: 2856

Re: Linear stage with 3.3" travel, stepper motor, and 0.5 micron encoder for about $100

Very interesting device and nice setup!! Would be interesting to see how this measures up to the popular THK KR types folks are utilizing. A number of years ago we started off with the excellent Pololu Tic devices on the RPi, but later moved up to the Trinamic devices because of the Motor & Velocity...
by mawyatt
Thu Jun 18, 2020 11:05 am
Forum: Equipment Discussions
Topic: Test wafer distribution: Many features, includes res chart
Replies: 80
Views: 15713

Beautiful images. Compared to the solar system, we are macro :D

Thanks for all the effort in getting these chips out to us, I really appreciate this!!

Cheers mate,
by mawyatt
Thu May 28, 2020 8:25 am
Forum: Equipment Discussions
Topic: AO Illuminator - LED replacement?
Replies: 6
Views: 1136

Voltmeter confirmed a dead bulb; I went ahead and sacrificed a Jansjo lamp for the cause; an ugly hack but it seems to work just fine! I had to file down the housing to fit - needed about 2 mm on both width and depth, the Jansjo could handle that with no problems. A few parts removed (bulb socket, ...
by mawyatt
Wed May 27, 2020 11:05 am
Forum: Equipment Discussions
Topic: Test wafer distribution: Many features, includes res chart
Replies: 80
Views: 15713

I'll take one also.

Best,
by mawyatt
Fri May 22, 2020 9:13 am
Forum: Equipment Discussions
Topic: Amazing Wafer Stepper Setup
Replies: 20
Views: 1857

The latest SOTA wafer lithography machines evidently cost well north of $100M US :shock:

Of course you need a backup and probably operate more than one line :shock:

Best,