how to mount bearings for leadscrews

[fnm]

I'm designing a router for milling plastics and soft metals as part of my hobby. My fixed end leadscrews will be according the attached outline using 7200B bearings and 2 Belleville washers for preloading. Cutting forces transmitted to the bearings can be about 120N and I pretend to apply 240N of preloading to contact angle bearings. My hesitations begins when I try to imagine how to implement practical mounting of this system because I can not evaluate friction forces between spindle axis and inner bearings and I would like to ask to experts some questions
-What type of fitting when machining spindle axis would be the most adequate. I mean what is the practical tolerance between spindle axis and inner 7200B bearing
-What is the maximum practical temperature a can apply when preheating 7200B for mounting bearings to spindle axis?
-What is the maximum practical forces for mounting inner rings to an external axis for a typical fitting?
Thanks in advanced for any hint

 

[BobM3]

Which bearings are you working on? Leadscrew bearings or spindle bearings?

 

[fnm]

I'm referring to end fixed supports for leadscrews with 7200B angle contact bearings turning at a maximum speed of 600-800 rpm

 

[diskullman]

Typically lead screw bearings are a 60º contact angle for higher thrust loads. The 7200B series is a 40º contact angle. Housings may also be available from most reputable bearing manufacturers.

Russell Giuliano

 

[BobM3]

You need to follow the bearing manufacturer's recomendations for the bearings (particularly for matched bearings used for precision applications). They will tell you the amount of interference fit required between the bearing bore and shaft OD. They should also be able to give you a good estimate of the axial load required to mount the bearings. They can also tell you the maximum allowable temperature for heating the bearings for assembly.

 

[BobM3]

Addendum to the above:

http://www.skf.com/portal/skf/home/products?maincatalogue=1&lang=en&newlink=9_1_0

You'll find a lot of good info on mounting angular contact bearings there.