23 May
2011
23 May
'11
6:30 a.m.
As for the pitch, I used those pitch guages which
conssit of little
strips of metal with accurately cut teeth in one edge. Alas my metric set
doesn't include 0.6mm ( which is odd, since it's common for M3.5 screws),
hut the imperial one that fits is 42tpi. 42tpi is about 0.605mm pitch. I
could beleive 0.6mm (it's not that accurate after all). The 40tpi
imperial gauge doesn't fit at all.
I'd still bet a donut, that a 5-40 would fit just fine for anything without a long
engagement.
Tim.
10:20 a.m.
On 5/23/2011 10:56 AM, Fred Cisin wrote:
On Mon, 23 May 2011, Shoppa, Tim wrote:
Hmm... that, a large hammer and WD40. :)
I'd still bet a donut, that a 5-40 would fit
just fine for anything
without a long engagement.
Are you suggesting that ARD should use screws that are "almost the right
size"?? 
6:25 p.m.
ben wrote:
On 5/23/2011 10:56 AM, Fred Cisin wrote:
Uh oh. Quick, to the bunker! :-)
On Mon, 23 May 2011, Shoppa, Tim wrote:
Hmm... that, a large hammer and WD40. :) I'd still bet a donut, that a 5-40 would fit
just fine for anything
without a long engagement.
Are you suggesting that ARD should use screws that are "almost the right
size"?? 
12:19 p.m.
> could believe 0.6mm (it's not that accurate
after all). The 40tpi=20
> imperial gauge doesn't fit at all.
Just rechecked 'em with another pitch gauge, they are certianly 0.6mm
pitch...
I'd still bet a donut, that a 5-40 would fit just fine for anything without=
a long engagement.
Oh, it might do. I could probably force a normal M3 (0.5mm pitch)
in there too.
However, I am not sure 5-40 UNC screws are any easier to find (at least
not over here, as I said, even getting the 'mormal' 2-56, 4-40, 6-32,
8-32 is difficult). And it's not 'right'. I might as well spend a couple
of afternoons in the garage making the right screws.
-tony
2:25 p.m.
On 23 May 2011 at 20:19, Tony Duell wrote:
However, I am not sure 5-40 UNC screws are any easier
to find (at
least not over here, as I said, even getting the 'mormal' 2-56, 4-40,
6-32, 8-32 is difficult). And it's not 'right'. I might as well spend
a couple of afternoons in the garage making the right screws.
There are some application-specific wierdnesses too. For example,
tacquets on US-made piston valvesets for musical instruments are 3-
48. Fortunately, I do have a set of taps and a die for that
thread.
--Chuck
24 May
24 May
12:15 p.m.
There are some application-specific wierdnesses too.
For example,
tacquets on US-made piston valvesets for musical instruments are 3-
48. Fortunately, I do have a set of taps and a die for that
thread.
Actually, my thread tables claim that 3-48 UNC is a normal thread (well,
as 'normal' as any of the odd-numbered ones).
-tony
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