Author Topic: 1st I.C. build "Tiny"  (Read 13331 times)

Offline Dave Otto

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Re: 1st I.C. build "Tiny"
« Reply #330 on: October 06, 2017, 02:17:35 AM »
Thanks for the explanation Bob.
I guess I'm still wondering what guys do when the drill is smaller than the chisel point of the center or spotting drill?
What if, say you were needing to drill a .005" orifice in a propane jet? Even the smallest center drill has it's limitations.

Dave


Offline Hugh Currin

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Re: 1st I.C. build "Tiny"
« Reply #331 on: October 06, 2017, 05:26:29 AM »
Dave:

Maybe if you had a really small "spot" drill. Something like   this one which is 0.10mm (0.0039"). They make them down to
0.03mm (0.0012").
But then there's the problem of affording one. :-0

Disclaimer: I don't own stock and haven't ordered from them. They just popped up in an Internet search. Could be vapor ware. :-)

Thanks for the explanation Bob.
I guess I'm still wondering what guys do when the drill is smaller than the chisel point of the center or spotting drill?
What if, say you were needing to drill a .005" orifice in a propane jet? Even the smallest center drill has it's limitations.

Dave

Hugh Currin
Klamath Falls, OR, USA

Offline 90LX_Notch

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Re: 1st I.C. build "Tiny"
« Reply #332 on: October 08, 2017, 06:42:21 PM »
Thanks for the explanation Bob.
I guess I'm still wondering what guys do when the drill is smaller than the chisel point of the center or spotting drill?
What if, say you were needing to drill a .005" orifice in a propane jet? Even the smallest center drill has it's limitations.

Dave


Great question Dave.  I don't know.  I haven't drilled anything below #80.  If my usual method didn't work, I'd most likely sharpen a sewing needle to a very fine point with India and oil stones and try that.  The idea being, to just make a small impression that the drill could pick up. 

-Bob
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Offline Mosey

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Re: 1st I.C. build "Tiny"
« Reply #333 on: October 12, 2017, 01:15:20 PM »
How about first a tiny pin prick with an optical center punch, then the tiny center drill before attempting to drill very small holes? This optical punch works for me and I bought 2 of them years ago when they were affordable.

Mosey
SPI - 3/8" Tempered Steel Optical Center Punch
2-3/4" OAL
MSC Part #: 93712990

Offline 90LX_Notch

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Re: 1st I.C. build "Tiny"
« Reply #334 on: October 14, 2017, 07:50:48 PM »
Mosey-

Don't forget that Dave was talking about a .005 diameter drill bit and it's chisel point.  I doubt the tip of any punch is that small.

-Bob
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Offline 90LX_Notch

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Re: 1st I.C. build "Tiny"
« Reply #335 on: October 14, 2017, 07:55:18 PM »
Zero progress to report on Tiny.  Last weekend was full of family stuff and today I am having another bad allergy day.  I am beginning to think that I am cursed as far as making this gear cutter!  Each time I plan on making it, something derails the plan.


-Bob
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Online b.lindsey

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Re: 1st I.C. build "Tiny"
« Reply #336 on: October 14, 2017, 10:03:19 PM »
Hang in there Bob. It's not a race after all. I have been running mine all weekend at our antique engine show, and can claim the smallest hit and miss here, amongst the full size farm engines.

Bill

Offline 90LX_Notch

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Re: 1st I.C. build "Tiny"
« Reply #337 on: October 17, 2017, 02:57:12 AM »
Thanks Bill.  It's just been a very long race.  The finish line is close.

-Bob
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Offline 90LX_Notch

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Re: 1st I.C. build "Tiny"
« Reply #338 on: October 17, 2017, 03:07:00 AM »
Update:

I started the gear hob yesterday.  I've been having trouble with the 29 degree form tool.  So far, I have broken the tip off three times.  Given that it is for a 48 pitch, 14.5 pa hob, the tip is very small ( a few thousandths) and very delicate.  I have a few more things to try before I go another route.

-Bob
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Online b.lindsey

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Re: 1st I.C. build "Tiny"
« Reply #339 on: October 17, 2017, 11:37:56 AM »
Bob, I will be happy to let you borrow the cutter(s) I have for this job, just let me know.

Bill

Offline 90LX_Notch

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Re: 1st I.C. build "Tiny"
« Reply #340 on: October 17, 2017, 09:48:48 PM »
That might be my best Bill; if you don't mind lending them out.

-Bob
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Online b.lindsey

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Re: 1st I.C. build "Tiny"
« Reply #341 on: Today at 12:23:54 AM »
Bob, here is what I have. 48 pitch, 14.5 PA, one cutter for 14-16 teeth and one for 26-34 teeth. Both have a 7/8" hole, so you may have to make a mandrel. I made a bushing so I could fit them to the sherline cutter arbor which I think is for a 1/2" hole. I still have your p.o. Box address if that will work.

Bill

Offline 90LX_Notch

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Re: 1st I.C. build "Tiny"
« Reply #342 on: Today at 12:45:24 AM »
Thanks Bill so very much.  Yes the POB will work fine. 

-Bob
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Online b.lindsey

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Re: 1st I.C. build "Tiny"
« Reply #343 on: Today at 12:57:43 AM »
Will get them out to you tomorrow then.

Bill

Offline 90LX_Notch

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Re: 1st I.C. build "Tiny"
« Reply #344 on: Today at 02:09:19 AM »
Thanks Bill.  You rock!

-Bob
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