Stub arbor for mill

M

Mark_f

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I need to slot some screw heads and I hate messing with a 14 inch arbor with a dozen spacers on it and setting it up in the horizontal mill, so I made a stub arbor that is 2 inches long where the cutter fits and has an 11/16" stub to put in a collet. I made this 1 inch diameter one and it worked so well, I am going to make a couple more sizes. I put a center in the outer end so I can use the overarm for heavier work. Sometimes you just don't need a big heavy long arbor to do the job. The arbor was made from a 1 1/2" diameter cutoff and the spacers were made from some 1" nuts for bolts that were turned to 1 1/4" OD and bored to fit the arbor, then parted off to various lengths.

Mark

arbor parts.jpg
completed stub arbor.jpg

arbor parts.jpg completed stub arbor.jpg
 
That's a great idea. The outer 2/3's of my arbor are always empty. Gotta be more rigid being closer to the meat of the machine too.
 
ecdez said:
That's a great idea. The outer 2/3's of my arbor are always empty. Gotta be more rigid being closer to the meat of the machine too.
Click to expand...

yes ,and put a center in the outer end so you can still use the over arm if you want.
 
Looks very nice! And just curious, is it left hand thread because you only have one spindle direction on your mill/machine?
 
No, It is left hand thread because I am left handed and stand to the left of the machine. This makes my view of the cutting much better and easier. I have a right hand arbor and they work good too. this just works better for me. ( bet you didn't think there was a good reason ...huh) :roflmao:

Mark
 
I'm new to horizontal machining. I just recently got a nice little Hardinge TM. It seems that the way you have your arbor set up it will loosen the nut if it is left hand thread. When I use a standard milling bit I run the machine in forward but with the over-arm and arbor, which has a left hand nut, I run the machine in reverse with the cutter reverse of what you have shown. Not sure which is correct but I compare to a worm drive Skill saw with a left hand nut on it.

Aaron
 
you are correct. Allmost all my arbors are left hand for the reason I stated. I misspoke here. this one is right handed. I have two that are right handed and four that are left handed. I meant to make this one left handed like my print is drawn but forgot when I threaded it. I didn't realize my mistake until I started the mill and the nut came loose. I have made another that is left handed, because I prefer left hand arbors.

Mark :allgood:
 
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