reamer drilling guide chart

[garrygunParticipant @garrygun]

Hi guys,would there be a drilling, reaming,chart guide i could download?

i have put in a search, but found nothing.

Thanks Garry..

[garrygunParticipant @garrygun]

[Trevor WrightParticipant @trevorwright62541]

Garry,

Leave around 0.1mm or 0.004" material on the sides of the bore ( drill/bore 9.8mm for 10mm).

From small to large bores the depth of cut stays the same.

Trevor

[garrygunParticipant @garrygun]

Thanks Trevor, that must been ESP 10mm was the exact size i needed.

Thanks Gray, ive down loaded that info& kept copy in the workshop.

Job now finished..

[Sub MandrelParticipant @submandrel]

I generally leave about 1/64" (all my reamers are imperial). Possibly a little high looking at the reference (excellent by the way) supplied by Gray.

I hadn't appreciated that hand reamers can cut on the end (like a machine reamer) as well as the taper before.

I can't imagine plunging a 1/2" reamer into steel at 400 rpm and 8 metres a minute!

All but one of my reamers are hand reamers, although i think the smallest ones (3/16" and smaller are parallel flute and possibly really count as parallel broaches).

Neil

[Sub MandrelParticipant @submandrel]

Thanks Graham,

I do use my reamers faster than I used to, but it looks like I should step up another gear!

I will bear in mind what you say about periodically withdrawing hand reamers – i did manage to chip a couple of the cutting edges on one once, and still have no idea what caused it. It still works, as the chips were near the tip of the lead, and it didn't affect it where it cuts full size. I have considered cutting off the end and regrinding it as a machine reamer – that seems a lot easier than grinding off an awful lot of metal to restore the lead, also I could do the former without making a flute grinding attachment for my grinder.

I have noticed that all my reamers give a relatively easy fit on silver steel of the same nominal size. For this reason I tend to use them when the finish in a hole is the most important consideration.

It's amazing how much there is to learn about apparently simple tools.

Neil

[Geoff~Participant @geoff46085]

So would it be ok to use a hand reamer in a machine, as long as you withdrew it periodically?

Geoff~

[colin hawesParticipant @colinhawes85982]

When drilling holes for reaming it is best to use a smaller drill first then drill to reaming drill size before using the reamer. This obviates the risk of a reaming size drill cutting oversize due to inaccurate point grinding or flexing under load. Colin

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