Recent content by Trix4kids

By the way, the guide is .25x.75x72". Will this cause high outgassing and why?

I am trying to use a linear guide for a door in a vacuum chamber. It is aluminum with a clear hard anodize surface. The pressure of the chamber will be 3x10-5 Torr and Temp. will be 150F. I was told not to use anodized aluminum because of its porosity but it doesn't make much sense to me. I...

Hello, I am looking for a cheap ($200) extensometer to measure strain of a bike spoke. Are there any extensometers available that will simply attach to the spoke to measure strain? The max load will be 50lb. Thanks.

Yes that is the rack with a thickness of 3/8" and length of 6'. I have searched hard for aluminum and nonmagnetic stainless racks but they are all custom jobs with high pricing. Mcmaster does sell the size but only in brass and magnetic stainless. The brass rack is about $50.

Thanks. You have a point.

Unfortunately, the budget of this project won't allow the high prices of electroless nickel plating. But I did think of that option. That size brass rack was quoted at $250 for plating.

Anyone know if a 3/8x3/8x40" brass rack will outgass at T=160F and P=10^-6Torr

no longer needs to be electrically nonconductive

Thanks guys. Now I am looking for 304 stainless or aluminum gears with a max height of 3/8" for the rack but none of the gear companies have responded. I received a quote from rush gears for close to $2000 for a 6ft length using aluminum!!

Is there a way to make a C1018 steel gear rack nonmagnetic? I have tested aluminum in the chamber and the fact that it is conductive has not affected the process. Therefore, the material I am looking for no longer has to be electrically nonconductive, only nonmagnetic.

I have found some gears made from DURACON (M25-44). Does anyone know if they will survive the temp and press and if they are low outgassing?

Maui, Do you know what that would cost and what companies can do that? I was thinking of using Delrin, though I am unsure if it can handle the low pressure. I am almost positive it is low outgassing.

Hi, I was looking for the right materials for a rack/pinion design to open a door. Here are some constraints. Temp=160F Pressure=10^-6Torr all parts must be low outgassing, nonmagnetic and electrically nonconductive. I thought of using aluminum for the door/rack/pinion since it is...

I thought of anodizing the aluminum to make it nonconductive, however the anodizing will cause high outgassing which is not allowed. Here are some constraints. Temp=160F Pressure=10^-6Torr all parts must be low outgassing, nonmagnetic and electrically nonconductive. Any suggestions?

Mikey, Thanks for your response. I did fail to realize the aluminum door would create some inductance. Any type of actuator will not work. There is a 24" envelope on the side and the door itself is 22" long. We really need a rack and pinion design but all materials must be...