first milling project questions
I am a new owner of a small metal lathe and milling machine. My first
milling project will be some half inch hinges for a Christmas present.
Materials will be brass for the hinge and drill rod for the pin. I am
reverse engineering a hinge that has a 5/64 inch diameter pin.
My third edition American Machinists Handbook states that for a press fit
the pin should be 0.0075 to 0.001 inch larger than the hole. For a running
fit the hole needs to be 0.0005 to 0.001 inch larger than the pin.
I plan on using an arbor press to install the pin in the hinge.
By going with wire gage drill rod and chucking reamers I have settled on the
following:
The hinge pin would be #46 drill rod, 0.079 in. diameter.
The press fit hole will be either a 5/64 bit (0.0781) or a #47 ream
(0.0785).
The loose fit hole will be a #46 ream (0.0810) sizing a hole left by a
5/64th bit.
(dimensions taken from travers catalog)
Here are my questions:
1. Which is easier to work with, Oil or Water Hardened drill rod?
2. Will I be able to use a cutoff tool on my lathe to cut the pins to
length?
3. Are my choices for drill/ream/rod sane?
4. Is there something obvious I should know before starting on this?
Thanks for your help.
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