Thanks: 0
Likes: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 1 to 15 of 23
-
3rd May 2014, 10:58 PM #1Most Valued Member
- Join Date
- Oct 2010
- Location
- melbourne, laverton
- Posts
- 1,910
4 1\2 inch 6 tpi uns thread caculations...opps wrong size
hi all. can some one please help me out and give me the
the minor dia for an internal 4 1\2 6tpi uns thread.
I haven't got any of my books here. I'd like to make a test ring.
for the thread on some L0 safety taper backing plates i have to make/
making.
have fun
aaron
im not shore how i got that wrong so ive edited above post its 4 1/2 not 2 1/2 uns 6tpi.
hopfully phil or some one notices.
-
3rd May 2014, 11:41 PM #2Most Valued Member
- Join Date
- Sep 2011
- Location
- Ballarat
- Age
- 65
- Posts
- 3,103
Hi Aaron,
The minor Diameter is 2.2834" for general purpose and
2.3016" for close tolerance
Phil
-
3rd May 2014, 11:48 PM #3Distracted Member
- Join Date
- May 2010
- Location
- Lower Lakes SA
- Age
- 58
- Posts
- 2,607
I got a slightly different answer from here: http://theoreticalmachinist.com/Thre...dImperial.aspx
That being 2.32 - 2.35 ish. If I did it right.
-
3rd May 2014, 11:52 PM #4Most Valued Member
- Join Date
- Sep 2011
- Location
- Ballarat
- Age
- 65
- Posts
- 3,103
-
4th May 2014, 12:11 AM #5
Shopcalc gives 2.365" for a 75% contact. Thats as a sugested "tapping drill" size.
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
-
4th May 2014, 12:36 AM #6Most Valued Member
- Join Date
- Oct 2010
- Location
- melbourne, laverton
- Posts
- 1,910
thread calcs
hi again. plil bryan and ew thanks.
the last few times I've cut internal threads. i wasn't happy with the result.
a bit like a c**k in a shirt sleeve.
So i think ill go for close tolarance size. Its meant to be a thread gauge of sorts
so a close fit would be appropriate.
thanks again
aaron
-
4th May 2014, 12:42 AM #7Most Valued Member
- Join Date
- Sep 2011
- Location
- Ballarat
- Age
- 65
- Posts
- 3,103
Apologies Aaron,
I have given you external thread minor Diameters.
Close tolerance internal thread will be 2.3196"
Phil
-
4th May 2014, 06:33 PM #8Most Valued Member
- Join Date
- May 2011
- Location
- Murray Bridge S Aust.
- Age
- 71
- Posts
- 5,959
Hi Aaron, the only thing I can find is a formula for drill sizes for thread cutting taps.
........................................................................... ......% of full thread
Drill size = basic major dia. of thread 4.5" minus .0130 X ---------------- = Drill size
................................................................................ .threads per inch
example: to find tapping drill size
for 1/4"- 20 with 75% thread
........................................75
Drill size = .2500 - .0130 X --- = .2010 inches
.......................................20
This is taken from the Engineers Black Book 1st edition
Hope this helps
Regards
Kryn
-
6th May 2014, 01:17 AM #9Most Valued Member
- Join Date
- Oct 2010
- Location
- melbourne, laverton
- Posts
- 1,910
thread formulas
im not shore what formulas ive been using and haven't been able to find
a suitable online calculator.
kb pens thanks for that one but it doesn't seem to be right
i get 59.83 ????
ill have another look
bryan that calculator only goes to 4"
aaron
-
6th May 2014, 02:04 AM #10Intermediate Member
- Join Date
- Apr 2013
- Location
- San Diego
- Posts
- 28
I've written a spreadsheet for thread calculations. If anyone is interested I'll attach it for downloading.
Gene
-
6th May 2014, 02:45 AM #11
This is what i have been using, will go as big as you want. http://home.scarlet.be/mini-draaien-...rogram-01.html
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
-
6th May 2014, 03:19 AM #12Most Valued Member
- Join Date
- Oct 2010
- Location
- melbourne, laverton
- Posts
- 1,910
thanks
thanks guys. ive got a mac.. thanks gene.
aaron
-
6th May 2014, 06:58 PM #13Most Valued Member
- Join Date
- Jun 2007
- Location
- sydney ( st marys )
- Age
- 64
- Posts
- 4,890
Try 4.284"
-
6th May 2014, 07:29 PM #14
I think if Aaron bores to 4.284" then threads the for May be just a tiny bit too loose.....
But what would I know, my answer came from a computer program.1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
-
6th May 2014, 07:48 PM #15Golden Member
- Join Date
- Sep 2008
- Location
- Riddells Creek, Vic.
- Posts
- 838
From Machinery's Handbook - 4.320 to 4.3396 for class 3B.
All you have to do is use dimensions for any 6 tpi UN thread.
Lex.
Similar Threads
-
Cutting a 1 1/2 Inch 8 TPI - UN thread
By 19brendan81 in forum METALWORK GENERALReplies: 11Last Post: 9th Jun 2010, 03:40 PM