Machining questions
I'm trying to get a handle on tolerancing and fits (I'm really an EE, not an ME) . I've been coddled in the past because our in house machine shops would figure out the tolerancing for me. However our in house shops have recently been scaled back so far that I am going to have to submit work outside.
Looking through my Machinery's Handbook, I see fits like LC1 through LC11. On a prevoius page it shows different types of machining processes such as broaching, milling, etc. None of those types of machining show anything below a grade 4 tolerance grade. This makes me wonder if anything below a grade 4 is practical.
The handbook verbally describes running fits from RC1 to RC9. It looks like I would choose an RC4 fit for my moving parts based on the verbal description, but am wondering if that would be practical.
Also, I'm going to be using mostly hard coat anodized aluminum parts. The shops I have worked with before would tell me this adds 0.001" to 0.002".
Any insight into any of this would be greatly appreciated (and needed).
Thank you,
Eric
I'm trying to get a handle on tolerancing and fits (I'm really an EE, not an ME) . I've been coddled in the past because our in house machine shops would figure out the tolerancing for me. However our in house shops have recently been scaled back so far that I am going to have to submit work outside.
Looking through my Machinery's Handbook, I see fits like LC1 through LC11. On a prevoius page it shows different types of machining processes such as broaching, milling, etc. None of those types of machining show anything below a grade 4 tolerance grade. This makes me wonder if anything below a grade 4 is practical.
The handbook verbally describes running fits from RC1 to RC9. It looks like I would choose an RC4 fit for my moving parts based on the verbal description, but am wondering if that would be practical.
Also, I'm going to be using mostly hard coat anodized aluminum parts. The shops I have worked with before would tell me this adds 0.001" to 0.002".
Any insight into any of this would be greatly appreciated (and needed).
Thank you,
Eric