Fine/Coarse Adjustment of Plate

[kevc70]

Hello,

I am looking for ways of moving a plate in an axial direction. There is a secondary plate that I want to move rotationally as well. There needs to be fine adjustment available so that a person can rotate the plate 1-2 degrees and lock in the location of the plate. The same holds true for the axial translation. I was thinking possibly a knob, worm gear, cam assembly would be the answer but wanted to get some more feedback.

Thanks,

Kevin

 

[desertfox]

Hi kevc70

Can you upload a pic or drawing of your arrangement, difficult to advise on the info you have given us.

desertfox

 

[MintJulep]

http://cgi.ebay.com/TROYKE-9-ROTARY...QQptZBI_Tool_Work_Holding?hash=item414a1d40be

 

[kevc70]

Actually this is for an optics system..........there are projection and focusing lenses within these plates and I would like to rotate and/or move these plates axially. I was looking at having a knob assembly threaded into both sides of the plate that will move the plate axially. the same would hold true for the rotation requirement. This would potentially give the fine adjustment, but looking for other ideas.

Thanks,

Kevin

 

[lumenharold]

Is this a continuation of this thread?

http://www.eng-tips.com/viewthread.cfm?qid=257637&page=2

Harold
SW2009 SP4.0 OPW2009 SP2 Win XP Pro 2002 SP3
Dell 690, Xeon 5160 @3.00GHz, 3.25GB RAM
nVidia Quadro FX4600

http://www.lumenflow.com

 

[BobM3]

One way: Use a screw to push the table. The other end of the table is spring loaded. Mount a second finer pitched screw inside the first.

 

[kevc70]

would a fine pitch screw adjuster be the equivalent of what you are suggesting......similar to what is used on micrometers? these might do the trick for axial translation but not sure about rotational adjustment.

thanks,

Kevin

 

[BobM3]

Does a micrometer (.025"/turn) give you the "fineness" you need? If so, I like these (at the bottom of the page):

http://www.mcmaster.com/#catalog/115/2532/=4k6n5w.

You can also buy just the micrometer head:

http://www.mcmaster.com/#micrometer-heads/=4k6nzp.

For rotary, maybe a movable block on the rotating table that the micrometer (and spring) adjust against.

 

[unclesyd]

Nanopositioning devices.

http://www.physikinstrumente.com/en...ning/nanopositioning_multi-axis_selection.php

Here are some differential screw adjusters. You can get most any accuracy you desire. Look around.

http://search.newport.com/?sku=AJS127-02H

Here is a goniometer that maybe of interest. They are others on the market that maybe less expensive.

http://www.optosigma.com/miva/merch...duct_Code=pg341-344&Category_Code=Goniometers