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35/64 Twist Drill

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Howard Lewis07/02/2023 11:41:41
7227 forum posts
21 photos

Zeus charts often give the "ideal" tapping size, but also list the likely nearst stock size, whether Numer or Letter .

For many purposes, a slightly larger tapping drill, although it reduces % engagement will not prevent a safe clamp load being applied.

Most of us are not into jobs that need fasteners to be tightened into yield, anymore.

Howard

Edited By Howard Lewis on 07/02/2023 11:50:15

Nealeb07/02/2023 11:56:39
231 forum posts

I did wonder if this size bit used in a handheld drill (possibly at that date? That's what apprentices were for...) would give a drive-size fit for, say, a 9/16" rivet.

Seems more likely that they were left over when all the useful drills from the set had been lost/broken/blunted!

martin haysom07/02/2023 12:41:13
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165 forum posts

you are all just over thinking it. that drill is just right for drilling a 35/64th holes

Dr. MC Black08/02/2023 19:30:17
334 forum posts
1 photos
Posted by Weary on 07/02/2023 08:41:11:I purchased it as I wanted 14mm holes and was offered the 35/64" drill a lot cheaper than 14mm. 35/64" is 0.1mm (0.004" ) diameter undersize,

Who sells Imperial size drills Treasurer attractive prices?

Dr. MC Black08/02/2023 19:35:06
334 forum posts
1 photos
Posted by Nigel McBurney 1 on 07/02/2023 10:45:41:

If your drills are pre war then you may find that some could be carbon steel rather than HSS easy check is when grinding them HSS gives off reddish colour sparks ,carbon drills give off white bright sparks. Carbon steel drills are not much use nowadays cutting speed is far too low and the temper easily lost,

I have checked the drills

The shanks were reduced so they could be used in a corded electric drill by my Father so some of the markings have been lost

Some of the drills are marked CAST STEEL - Two Dogs brand.

One is a Dormer Brand marked "HS" (not HSS - NOT a typographical error!)

I have defective colour vision so there's no chance of being able to distinguish between Carbon and High Speed Steel by spark colour!!!!

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