I could use a boring bar but it's faf. I need 6 holes. It's doable but a bit to just cut to the chase would be nice
Not used my lathe for so long i can't even remember where it is!
I need to make a couple of pieces from alloy on the lathe... I need to produce 25mm and 30mm holes with flat bottoms...
Suitable milling cutters are upwards of £25 each... Rather a lot for a one off job... If I drill out the meat of the hole would a forstner bit be man
enough to finish the job with a flat bottom?
Failing that, anyone have a 25mm/1" cutter and a 30mm cutter they would rent me?
I counter-bored a lump of ally with a flat wood bit!! It chattered a bit but with plenty of oil and a very low speed, it did the job. I would say the Forstner bit would do a better job as long as you can keep the shank short or well supported to stop it from wandering off!
Incidentally, is it not possible to use a boring bar to make the holes? I find grinding up old files make good tiny boring bars!!
Or a reamer??
Reamers don't tend to have a cutting face on the tip!
I could use a boring bar but it's faf. I need 6 holes. It's doable but a bit to just cut to the chase would be nice
Not used my lathe for so long i can't even remember where it is!
I've also used a 10mm end mill in the tool post to chovel out a 30mm flat bottomed hole....
I bet my college lecturer is spinning in his grave.....
I used a forstner bit to square off the 15mm holes for the injectors in my modified manifold.
I have had good results milling aluminium with wood router bits. They tend to be carbide tipped and you might get one in a diameter suitable for your purposes.
quote:
Originally posted by chris-g
I have had good results milling aluminium with wood router bits. They tend to be carbide tipped and you might get one in a diameter suitable for your purposes.