Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives :: Books
Support This Site: Contributors :: Advertise


It is currently Sep Wed 19, 2018 2:04 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 32 posts ]  Go to page Previous  1, 2
Author Message
 Post subject: Re: Oddball screw
PostPosted: Mar Thu 01, 2018 4:41 am 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 4543
Location: Perrysburg, OH, U.S.A.
I use a lot of #4-40 screws in building small projects. It's a very common size. However, I have a small stash of #4-36 that my father got for something or other. McMaster-Carr doesn't even carry them! Now that's a <ahem> 'screwy' size! Never had a use for them, just like the bronze roofing nails I inherited.
John

_________________
“Never attribute to malice that which can be adequately explained by stupidity.”
― R. A. Heinlein


Top
 Profile  
 
 Post subject: Re: Oddball screw
PostPosted: Mar Thu 01, 2018 2:02 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 13743
Location: Fernandina Beach, FL
pixellany wrote:
Don Cavey wrote:
Thanks Mark, I just ordered three different "odd" size taps that I didn't have.

He who dies with th most tools wins......;)

Hear, hear! Good thought.

_________________
Don


Top
 Profile  
 
 Post subject: Re: Oddball screw
PostPosted: Mar Thu 01, 2018 2:46 pm 
Member
User avatar

Joined: Feb Sun 02, 2014 9:13 pm
Posts: 1836
Location: Roanoke, VA
pixellany wrote:
How many know of----or have used---all these sizes ...

I have encountered all of them. Another seldom-seen thread is 4-36. I use a lot of 4-40, it is really quite common. I stock a lot of 4-40 as well as a decent selection of 2-56, 3-48, and 4-36.

_________________
Dale H. Cook, Antique Radios / Test Equipment (GR/HP/Tek)
http://plymouthcolony.net/starcity/radios/


Top
 Profile  
 
 Post subject: Re: Oddball screw
PostPosted: Mar Thu 01, 2018 4:27 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 398
Location: Manchester, NH
I use 0-80 frequently here in the microwave business and typically use a pin vise to hold the tap -- main thing I have found is to go slow - back that tap out and clean the hole and tap every 1/4 to 1/2 turn and it usually goes pretty well --- for aluminum use alcohol as a fluid -- brass probably same not sure on that one -

Recommended tap drill for 0-80 is .0469 dia I usually find going the next size larger makes the tapping go easier yet still gives good retention - try using an .052 dia in a scrap piece first and see how that works for you --

For what its worth

Griz


Top
 Profile  
 
 Post subject: Re: Oddball screw
PostPosted: Mar Thu 01, 2018 7:10 pm 
Member
User avatar

Joined: Jan Mon 18, 2010 2:13 am
Posts: 17021
Location: Dayton Ohio
I like the idea of a pin vise, but I think my tap is a bit big for one.
Perhaps its body is good enough as a handle?

-Steve


Attachments:
0-80tap1.jpg
0-80tap1.jpg [ 127.48 KiB | Viewed 329 times ]

_________________
Radio Interests
-Zenith
-Sparton
-Pre-War FM
Consoles and floor models, the bigger, the better!
Top
 Profile  
 
 Post subject: Re: Oddball screw
PostPosted: Mar Thu 01, 2018 8:59 pm 
Member

Joined: Mar Wed 16, 2011 10:44 pm
Posts: 755
Location: Peekskill, NY
Find a small diameter radio knob. If you can find one with 1/8 inch shaft, that's best,
otherwise you'll need to make a bushing.

Setscrew on the knob holds the tap.

Best knob diameter for 0-80 is around a half inch.

I use knobs on all my small taps, up to around 8-32 or so.

The tap you show there is a two flute gun tap, the chips are pushed out the front. They
work best on through holes, but if you leave a deep enough blind hole (leaving a place
for the chips to pile up) they're good too.

Do NOT stop and reverse the tap periodically they way you would do with a regular multiflute
hand tap. Don't stop, keep on going.


Top
 Profile  
 
 Post subject: Re: Oddball screw
PostPosted: Mar Fri 02, 2018 12:43 am 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 23188
Location: Haledon, NJ, usa
4-40 yes lots
and 2-56 once in a while, I think, ... sounds familiar

and sometimes 3-48

_________________
To be a man, Be a non-conformist, Nothing's sacred as the integrity of your own mind.
-Emerson


Top
 Profile  
 
 Post subject: Re: Oddball screw
PostPosted: Mar Fri 02, 2018 12:46 am 
Member
User avatar

Joined: Jan Mon 18, 2010 2:13 am
Posts: 17021
Location: Dayton Ohio
jim rozen wrote:
Find a small diameter radio knob. If you can find one with 1/8 inch shaft, that's best,
otherwise you'll need to make a bushing.

Setscrew on the knob holds the tap.

Best knob diameter for 0-80 is around a half inch.

I use knobs on all my small taps, up to around 8-32 or so.

The tap you show there is a two flute gun tap, the chips are pushed out the front. They
work best on through holes, but if you leave a deep enough blind hole (leaving a place
for the chips to pile up) they're good too.

Do NOT stop and reverse the tap periodically they way you would do with a regular multiflute
hand tap. Don't stop, keep on going.


ok, maybe I should find a different tap as this will be a blind hole. A real problem if the tap would break.

I love the idea of using a knob.

-Steve

_________________
Radio Interests
-Zenith
-Sparton
-Pre-War FM
Consoles and floor models, the bigger, the better!


Top
 Profile  
 
 Post subject: Re: Oddball screw
PostPosted: Mar Fri 02, 2018 1:25 am 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 33178
Location: Maryland 20709, USA
azenithnut wrote:
ok, maybe I should find a different tap as this will be a blind hole.
Hi Steve,

What material are you tapping?

- Leigh

_________________
73 de W3NLB
http://www.AtwaterKent.info
Click "Grebe Stuff" for Synchrophase info


Top
 Profile  
 
 Post subject: Re: Oddball screw
PostPosted: Mar Sat 03, 2018 5:20 am 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 4543
Location: Perrysburg, OH, U.S.A.
azenithnut wrote:
jim rozen wrote:
Find a small diameter radio knob. If you can find one with 1/8 inch shaft, that's best,
otherwise you'll need to make a bushing.

Setscrew on the knob holds the tap.

Best knob diameter for 0-80 is around a half inch.

I use knobs on all my small taps, up to around 8-32 or so.

The tap you show there is a two flute gun tap, the chips are pushed out the front. They
work best on through holes, but if you leave a deep enough blind hole (leaving a place
for the chips to pile up) they're good too.

Do NOT stop and reverse the tap periodically they way you would do with a regular multiflute
hand tap. Don't stop, keep on going.


ok, maybe I should find a different tap as this will be a blind hole. A real problem if the tap would break.

I love the idea of using a knob.

-Steve

For a blind hole you need at least two taps. Start tapping with a taper tap:
Attachment:
Taper Machine Screw Hand Tap.JPG
Taper Machine Screw Hand Tap.JPG [ 9.95 KiB | Viewed 289 times ]

Then use a bottoming tap:
Attachment:
Bottoming machine Screw Hand Tap.JPG
Bottoming machine Screw Hand Tap.JPG [ 9.95 KiB | Viewed 289 times ]


I have a few sets of larger size taps like 1/4-20 with three taps: A tapered tap, a tap with a smaller tapered area and a bottom tap.
John

_________________
“Never attribute to malice that which can be adequately explained by stupidity.”
― R. A. Heinlein


Top
 Profile  
 
 Post subject: Re: Oddball screw
PostPosted: Mar Sat 03, 2018 11:30 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 4986
Location: Rochester NY USA
UNF 10-32 and 5mm are close. I had a 77 VW, attached the (optional) right side mirror with 10-32 flatheads (they fit fine) even though they were a 5 mm thread. The reverse will bind after a few threads. The big can electrolytic caps came with either size - use the wrong screw and it might SEEM tight without quite bottoming on the terminals. At my last job, some products were all metric, others all English H/W. Metric hardware was all color coded blue for easy identification.


Top
 Profile  
 
 Post subject: Re: Oddball screw
PostPosted: Mar Sat 03, 2018 11:43 pm 
Member
User avatar

Joined: Feb Sun 02, 2014 9:13 pm
Posts: 1836
Location: Roanoke, VA
I no longer deal with metric hardware at work as we no longer use reel-to-reel tape decks, and many popular brands of those were made overseas. Some low-power radio transmitters are made overseas, but none of my clients have those.

Dale H. Cook, Radio Contract Engineer, Roanoke/Lynchburg, VA
http://plymouthcolony.net/starcityeng/index.html


Top
 Profile  
 
Post New Topic Post Reply  [ 32 posts ]  Go to page Previous  1, 2

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 5 guests



Search for:
Jump to:  
























Privacy Policy :: Powered by phpBB