dontsendbubbamail said:Don't forget the tap magic.
Bubba
Vut? Tap magic? What's that?
dontsendbubbamail said:Don't forget the tap magic.
Bubba
swbluto said:Would filling the bore with some kind of material aid in the bit guiding task? Like maybe some kind of epoxy? It seems like the pulley will be made of aluminum. So maybe, aluminum shaving filled epoxy to approximate uniform density? Or maybe insert a 1/4" inch rod (Aluminum - assuming I can find that somewhere) cut to size and glue it in?
And then the center would be center punched to get it center and everything.
Would that be more desirable for 'results' if a n00b was attempting this?
liveforphysics said:swbluto said:Would filling the bore with some kind of material aid in the bit guiding task? Like maybe some kind of epoxy? It seems like the pulley will be made of aluminum. So maybe, aluminum shaving filled epoxy to approximate uniform density? Or maybe insert a 1/4" inch rod (Aluminum - assuming I can find that somewhere) cut to size and glue it in?
And then the center would be center punched to get it center and everything.
Would that be more desirable for 'results' if a n00b was attempting this?
Fitting the center of the hole with a rod, and drilling down through both together would likely result in better results than not, as the bit would hold center.
However, taking Matt up on his very kind offer to bore the hole for you would definitely be the path to best results. Matt will clamp it into something that fixes the work in relation to the bit extremely solidly, then use continuous lubrication feed and a low spindle speed with a short fat bit choked up in a mill chuck. Or he will plot a CNC to do a circle pattern, and do it that way. Either way, it will cut the hole as cleanly as you are going to get it.
Miles said:SW, If you do have a go at this, you will probably get a better result by fixing the pulley in the chuck of the drill press, somehow - also, if you can get hold of a 3 flute core drill.
I don't think that this is the way to go...swbluto said:although I could probably drill it to an undersized imperial approximate using an existing drill bit and then *gasp* file the rest until it fits. .
Miles said:I don't think that this is the way to go...swbluto said:although I could probably drill it to an undersized imperial approximate using an existing drill bit and then *gasp* file the rest until it fits. .
John in CR said:Gotta make friends with a 1 man or small machine shop till you have all your own machining tools.
John
Miles said:I meant that drilling undersized and filing out wouldn't be a good idea.
If you want to have a go at drilling it out, for the experience, I don't want to put you off.
Best to either use a 3 flute drill or mount the pulley on a soft steel rod and drill through rod and pulley together.
If you want to get someone else to do it, take up Matt's offer.
Miles said:If you use the method of mounting the pulley on a rod, you could use an ordinary 8mm stub drill.
http://www.mcmaster.com/#28255a53/=3efuql