Reaming drill sizs

[John PurdyParticipant @johnpurdy78347]

Roy

If I was to make an RE11 holder I would shorten it so the nut, when done up, is just proud of the body of the floating reamer holder and to remove as much weight as possible, I would open up the rear of the 1″dia. body to leave the wall only 1/8″ or so thick.

John

[Roy VaughnParticipant @royvaughn26060]

My thought too.  A custom body would be best.

Roy

 

[File HandleParticipant @filehandle]

Some time ago now I bought a used carbon hand reamer. I think I was over ambitious with it , not drilling a large enough hole, it became too tight and I sheared one of one of the cutting edges. I did see a box of hardly used carbon hand reamers for not a lot of money, but my experience with the first one put me off After reading this I used a machine reamer that I got with some other bits recently having read the advice here I tried again and it did a perfect job. What is the difference between machine taps with helical cutter and straight cutters?
I have acquired over time, mixed in with other purchases, some morse taper drills and a reamer. I have looked but assume that an adapter going from a plain shank to a morse taper is not made. I presently don’t have any machines that take morse tapers.
I nearly put this in beginners question as a new post, but seemed appropriate here.

Thanks

Keith

[John PurdyParticipant @johnpurdy78347]

Keith

“What is the difference between machine taps with helical cutter and straight cutters?” Do you mean reamers? If so spiral flute reamers are designed for use in holes that have a keyway or some such in them where a straight flute would catch in the open section. I find though  spiral flutes tend to give a smoother finish than straight flutes in any hole and prefer them, although they are more expensive.

John

[Howard LewisParticipant @howardlewis46836]

The difference between a hand reamer and a machine reamer is that a hand reamer has a longer lead in taper than a machine one.

If you want to an adaptor so that Morse taper tooling can be held in your machine, you can buy sleeves with an internal Morse taper and a plain OD.

They are available (try RDG for instance).

The problem might be that the OD of the plain sleeve is to big to be held in a drill chuck in the tailstock. In which case, you will need an adaptor to carry a lathe chuck on the tailstock, to accommodate the larger size.

Overall, I would suggest that if you have to make adaptors, while you are about it, you make the reamer holder floating, so that it can follow the hole.

If the reamer is held rigidly, and is off centre, it will act like a boring tool, removing more material from one side than the other, to produce a hole that is oversize.

Howard

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