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Differential Adjuster Screw


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Differential Adjuster Screw

Selection Guide for Adjustment Screws
Imperial
6 - 80
3/16" - 100
1/4" - 80
1/4" - 80 with Differential Adjuster
1/4" - 100
Polaris Matched Adjuster/Bushing Pair
Metric
M2.5 × 0.20
M3 × 0.20
M3 × 0.25

Features

  • Length of Screw: 1" (25 mm)
  • Coarse Thread: 1/4"-80
  • Fine Adjustment Resolution: 25 µm/rev
  • On-Axis Load Capacity: 11.25 lbs (5.1 kg)
  • Recommended Preload: 1 to 2 lbs (0.5 to 1 kg)

The DAS110 is ideal as a drop-in replacement for the standard 1/4"-80 adjusters used on most Thorlabs' Kinematic Mirror Mounts.

Coarse Adjustment
The knob A is fastened to the 1/4"-80 externally threaded Main Body B, as shown in the drawing above. This mechanism provides the coarse angular adjustment of the kinematic mount. Alternatively, knob "A" may be removed to expose a 5/64" hex socket which may also be used for coarse angular adjustment.

Fine Adjustment
The fine-adjustment (25 µm/rev) is actuated by inserting a 1/16" hex wrench through the clearance hole in the adjuster knob, or into the smaller hex socket if knob A is removed. For details on this hex mechanism, click on the mechanical drawing above for a detailed view. Each rotation of the DAS110 fine-adjustment mechanism yields a highly de-magnified displacement of just 25 µm.

The Main Body B is also internally threaded with an M3 x 0.40 thread, this thread holds the intermediate actuator C, which may be rotated by a hex wrench. The key to the design is that the intermediate actuator is both internally and externally threaded allowing a differential movement to be achieved between the intermediate actuator C and the Push Rod D, as shown in the drawing above.

The external thread of the intermediate actuator is the same M3 x 0.40 mm thread internal to the Main Body. When the intermediate actuator is rotated clockwise, it moves out of the Main body by 400 µm per revolution. Connected to the internal thread of the intermediate actuator is the Push Rod; the Push Rod mates to the intermediate actuator via a M3 x 0.375 thread and is restricted from rotating by the main body. Now as intermediate actuatoris rotated, it advances at the rate of 400 µm/rev. but the Push Rod retreats at 375 µm/rev. This results in a differential motion of the Push Rod that is equal to the net difference of the pitch of the two threads for total displacement of 25 µm/rev.

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Posted Comments:
Poster: tcohen
Posted Date: 2012-05-03 16:01:00.0
Response from Tim at Thorlabs: Thank you for providing your solution! This is the recommended way to remove the knob.
Poster:
Posted Date: 2012-05-03 15:33:40.0
You can insert a 5/64" ball driver in the back to hold the screw stationary and then rotate the knob with your fingers to unscrew. This worked for me.
Poster: inicolaescu
Posted Date: 2012-05-03 15:01:04.0
I hust received my order of 8 Differential Adjuster Screws, DAS110. The overview on this page states that the knob can be removed. I could not do it and I don't want to try too hard and damage the thread. How can this be done? Thank you, Ion Nicolaescu
Poster:
Posted Date: 2011-12-09 13:14:48.0
A response from Tyler at Thorlabs: Hello Sergio, the differential actuators on this page are not designed for use with a potentiometer. Instead they can be used to replace standard adjustors on optomechanical components to improve the resolution of the adjustment of that component.
Poster: sergio
Posted Date: 2011-12-08 11:57:09.0
Hello, I'm not an expert in electricity, but I'm working on a project and need some assistance. I have 10,000 and 100,000 OHM potentiometers to dim lighting in a room. My question is: Does this product work with potentiometers? and how is it installed? Your help will be greatly appreciated.
Poster: bdada
Posted Date: 2011-07-29 12:00:00.0
Response from Buki at Thorlabs: Thank you for sharing your experience.
Poster:
Posted Date: 2011-07-29 11:39:06.0
I had a little trouble getting the actuator to work: In addition to the 1/16" hex socket that turns the differential mechanism, the screw has a concentric 5/64" hex socket that drives the coarse thread. Thats not much bigger, and the 1/16" hex key I was using was a bit oversized, at 0.072". It was catching on the coarse adjust, and not letting the differential adjustment turn. The folks at tech support were very helpful, and all is good now. But I thought Id post here in case someone else has the same problem.
Poster: jjurado
Posted Date: 2011-07-07 13:24:00.0
Response from Javier at Thorlabs to brian: Thank you very much for your feedback! We will update the presentation of the DAS110 differential adjustment screw shortly to reflect all the changes you suggest here.
Poster: brian
Posted Date: 2011-07-07 09:56:09.0
I find that the picture on the right is too low resolution to easily understand the mechanism. The load rating mentioned here in the feedback area should probably be posted on the product description page. I also think it would be helpful if the matching brass inserts were shown in the related products.
Poster: jjurado
Posted Date: 2011-06-14 15:20:00.0
Response from Javier at Thorlabs to charley.hale: Thank you very much for contacting us. We currently do not have a concise value for the optimal preload when using this actuator. However, a preload of 1-2 lbs should provide enough support for the actuator to rotate smoothly. Keep in mind that this value should be subtracted from the maximum load capacity value of 11.25 lbs when using heavy loads.
Poster: charley.hale
Posted Date: 2011-05-09 13:56:44.0
I am also keen to know the optimal preload for this actuator; has it been posted elsewhere since the question noted earlier below?
Poster: bdada
Posted Date: 2011-04-13 14:19:00.0
Response from Buki at Thorlabs: The maximum load on the screw is 11.25 lbs or 5.1 kg. We will post the recommended preload shortly.
Poster:
Posted Date: 2011-04-12 15:59:51.0
What is the maximum load on the screw? What is the recommended preload for the screw?
Poster: Greg
Posted Date: 2011-01-11 11:07:45.0
A response from Greg at Thorlabs to carollo: We do not currently have a backlash specification for the DAS110. The adjuster is commonly used with a preload, which significantly minimizes backlash. However, I am working with our Mechanics group to see if they can give a nominal backlash value for you.
Poster: carollo
Posted Date: 2011-01-06 15:02:54.0
Is there a backlash specification for the coarse and fine adjustments? High spatial resolution is great, but if it comes with significant backlash that is an important consideration. Thanks!
Poster: apalmentieri
Posted Date: 2010-03-09 12:17:32.0
A response from Adam at Thorlabs to rivale23: You do not need two actuators to perform fine movements. All you need is a 1/16" hex wrench. A description of how the fine adjustment is below. The fine-adjustment (25 µm/rev) is actuated by inserting a hex wrench through the clearance hole in the adjuster knob. Each rotation of the DAS110 fine-adjustment mechanism yields a highly de-magnified displacement of just 25 µm. The Main Body "B" is also internally threaded with an M3-0.40 thread, this thread holds the intermediate actuator "C", which may be rotated by a hex wrench. The key to the design is that the intermediate actuator is both internally and externally threaded allowing a differential movement to be achieved between the intermediate actuator "C" and the Push Rod "D". See image under the overview tab. The external thread of the intermediate actuator is the same M3-0.40 mm thread internal to the Main Body. When the intermediate actuator is rotated clockwise, it moves out of the Main body by 400 µm per revolution. Connected to the internal thread of the intermediate actuator is the Push Rod; the Push Rod mates to the intermediate actuator via a M3-0.375 thread and is restricted from rotating by the main body. Now as intermediate actuatoris rotated, it advances at the rate of 400 µm/rev. but the Push Rod retreats at 375 µm/rev. This results in a differential motion of the Push Rod that is equal to the net difference of the pitch of the two threads for total displacement of 25 µm/rev.
Poster: rivale23
Posted Date: 2010-03-09 12:10:11.0
I need to know how does the fine movement works, i mean, once the wrench is inserted the movement turns to fine, do i need two moves to have the fine move?, or i need only one actuator to mke the screw move with the fine move
Poster: klee
Posted Date: 2009-09-29 10:04:00.0
A response from Ken at Thorlabs to john: We will send you the drawings in DWG format that should work with AutoCAD Rev 14.
Poster: john
Posted Date: 2009-09-29 09:16:29.0
I cannot open the DXF copy of the design drawing. Im using AutoCAD Rev 14. Is there a problem with this version
Poster: klee
Posted Date: 2009-08-26 15:37:27.0
A response from Ken at Thorlabs to mfaraday and aeinstein: The range of the fine adjustment for the DAS110 is about 250um. The locking nut is included with the DAS110.
Poster: aeinstein
Posted Date: 2009-08-25 22:07:26.0
Is a locking nut included, one is shown in photo at the top of the page but not down where the details of the product are provided.
Poster: mfaraday
Posted Date: 2009-08-25 22:04:12.0
Please add the approximate range of the fine motion portion of the DAS110. FCA200 is still noted in bullets but seems to be removed from page.
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DAS110 Support Documentation
DAS110 Miniature Differential Adjuster
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