b_unruhly
Mechanical
- Jul 16, 2024
- 8
Hello all,
Not sure if this belongs here or in the chemical section--apologies if I put this in the wrong spot. Hoping to reach a coating expert here.
We have a machined shaft we are trying to produce to drawing specs--which call for a Ra (Microinch) value of 20 or under.
This is inclusive of coating.
Even through our pre-coated parts are measureing out between 5 & 8, the ZN phosphate brings us up to 80, and then there is a layer of Mos2 that is applied afterwards.
Does anyone have any tips for maintaining surface rougness on Zinc-Phophate pretreatment on a CNC turned shaft? What is typical? Do we have the wrong supplier?
Or secondary processes that can smooth this out, without damaging the protective layer of coating?
Thank you in advance for your valuable input
Not sure if this belongs here or in the chemical section--apologies if I put this in the wrong spot. Hoping to reach a coating expert here.
We have a machined shaft we are trying to produce to drawing specs--which call for a Ra (Microinch) value of 20 or under.
This is inclusive of coating.
Even through our pre-coated parts are measureing out between 5 & 8, the ZN phosphate brings us up to 80, and then there is a layer of Mos2 that is applied afterwards.
Does anyone have any tips for maintaining surface rougness on Zinc-Phophate pretreatment on a CNC turned shaft? What is typical? Do we have the wrong supplier?
Or secondary processes that can smooth this out, without damaging the protective layer of coating?
Thank you in advance for your valuable input
