Fine adjustment screw
Fine adjustment screw
(OP)
Hello,
Do you know of a supplier for a fine adjustment screw(say 100 turns per inch resolution) , that is made of brass or aluminum?
Do you know of a supplier for a fine adjustment screw(say 100 turns per inch resolution) , that is made of brass or aluminum?





RE: Fine adjustment screw
For instance, say you made up a shaft 75mm long with 30mm of M10 x 1.5 on the head end (usually the head is hex or square) and an M8 x 1.25 thread on the front. Both threads will be of the same hand but the difference in pitch is 0.25mm. Now if one part of the screw is run into a fixed member and the other part into an adjustable member, the adjustable member will move 0.25mm for each turn of the screw.
This smaller the difference between pitches the smaller the movement per turn. The movement on this type of screw is often further subdivided by using an area on the shaft that is notched parallel to the long axis with an evenly divided number of slots. A ball plunger can then be used to 'click' into the slots as the screw is turned. In this way you can divide up turns of the screw so that the above combination gives you a movement of 0.025mm per click.
RE: Fine adjustment screw
RE: Fine adjustment screw
Al Kirby
askkkf@avci.net
RE: Fine adjustment screw
RE: Fine adjustment screw
it for you. Do you need br. or al. because of spark hazard,
magnetisim, or corrosion? Micrometer heads are available
graduated to .0001 in. from industrial suppliers like
msc - mscdirect.com -I have not seen any made from
non ferris matl. though. It would be too soft to use if
frequent adjustment is required. Steveh's method would
also be susceptible to wear because of the soft matl.
RE: Fine adjustment screw
Thorlabs has 3/16-100 adjustment screws
www.thorlabs.com
Newport Corporation also has 80 & 100 pitch screws
www.newport.com
I suspect there are quite a few more opto-mechanical suppliers that carry similar products.