Thread Wires.

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Thread Wires.

This topic has 34 replies, 17 voices, and was last updated 6 December 2018 at 07:09 by Speedy Builder5.

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3 December 2018 at 21:39 #26324
Alan .204
Participant
@alan-204
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3 December 2018 at 21:39 #383646
Alan .204
Participant
@alan-204
I would like to learn how to use thread wires I’ve a set of PD wires machinery’s hand book lots of good intention but for the life of me I can’t seam to figure it out, I assume you can measure metric threads as well as imperial ? I ask as it will be mainly metric I’ll be using now I’ve change to a metric lathe, just because it’s eaisier .

Alan.
3 December 2018 at 22:32 #383662
Michael Gilligan
Participant
@michaelgilligan61133
This might help, Alan : **LINK**

https://www.threadcheck.com/the-three-wire-method-of-measuring-pitch-diameter/technicalinfo/

MichaelG.
3 December 2018 at 22:52 #383663
Alan .204
Participant
@alan-204
Thanks Michael I’ve read through it but it doesn’t help me I’m afraid, to much for me to try and take in, I could do with an example of how you measure the thread from start to finish using the wires on a M12

Alan.
3 December 2018 at 23:40 #383667
Alan .204
Participant
@alan-204
The penny’s drops when you take another look at what your doing, when measuring a metric thread with the wire method it helps if the constant you take away from your measurement is the metric one and not the imperial one 😡😡😡😡😡😡😡😡 you know that feeling when you feel like a complete dick, hope that’s the last one for a while.

Thanks anyway Michael, Alan.
3 December 2018 at 23:42 #383668
JohnF
Participant
@johnf59703
Alan, a couple of links here — **LINK**

**LINK**

The first show how to – the second the calculations to find the over wire dimension

Hope this helps John
4 December 2018 at 01:50 #383674
John Reese
Participant
@johnreese12848
Measuring threads with wires requires three hands and a good deal of manual dexterity. Dropped wires can hide for eternity in the chip pan. A much handier solution is thread triangles.

http://www.fowlerprecision.com/Products/Thread-Gages/526033030.html

I was fortunate some years ago to find thread mikes at decent prices. If you can afford them they are the best way to measure pitch diameters.
4 December 2018 at 08:17 #383702
Michael Gilligan
Participant
@michaelgilligan61133
Posted by John Reese on 04/12/2018 01:50:51:

Measuring threads with wires requires three hands and a good deal of manual dexterity. Dropped wires can hide for eternity in the chip pan.

.

Does the kitchen double as your metrology lab ?

MichaelG.

.

P.S. … I see from another post, that you are in the US.

We may therefore be 'separated by a common language' destroying the joy of ambiguity.

Edited By Michael Gilligan on 04/12/2018 08:28:46
4 December 2018 at 09:55 #383720
jimmy b
Participant
@jimmyb
**LINK**

These are what you need!

I've got a spread sheet that works everything out if you put in the effective thread diameter. If you are interested, message me your email and I'll send it you.

Jim
4 December 2018 at 10:09 #383722
not done it yet
Participant
@notdoneityet
I’v got some older versions – a spring loaded coil which are for discrete threads. All Imperial – they are likely not made that way for many a year, so pre-metric offerings.. Have I used them regularly? – No! Only of use if one does not have a nut to trial fit.
4 December 2018 at 10:26 #383729
jimmy b
Participant
@jimmyb
nidy are these the ones you refer

**LINK**

Jim
4 December 2018 at 11:09 #383734
not done it yet
Participant
@notdoneityet
Mine are similar to those. Clearly still on offer and quite expensive for a comprehensive set.
4 December 2018 at 12:08 #383740
Tony Pratt 1
Participant
@tonypratt1
Using thread wires isn't that difficult, practice & a dab of grease to hold the wires normally does the trick.

Tony
4 December 2018 at 17:41 #383802
John Reese
Participant
@johnreese12848
Michael G,

No, my metrology lab is not in the kitchen. SWMBO will not permit metalworking tools in the house. I have a 24' x 30' shop in another county along with a 400 sq, ft. house.

I assume the term chip pan refers to something in the kitchen in Brit-speak. Please enlighten me.

What do you call the tray under the lathe that collects most of the swarf?

I have learned quite a bit of the terminology that is used in the UK from this forum. I would like to learn more.
4 December 2018 at 17:59 #383805
Michael Gilligan
Participant
@michaelgilligan61133
Posted by John Reese on 04/12/2018 17:41:49:

I assume the term chip pan refers to something in the kitchen in Brit-speak. Please enlighten me.

What do you call the tray under the lathe that collects most of the swarf?

.

Chip pan : **LINK**

https://en.m.wikipedia.org/wiki/Chip_pan

… as opposed to swarf tray

It's rather like bonnet vs hood, or boot vs trunk

MichaelG.
4 December 2018 at 18:03 #383807
Neil Wyatt
Moderator
@neilwyatt
Posted by John Reese on 04/12/2018 17:41:49:

I assume the term chip pan refers to something in the kitchen in Brit-speak. Please enlighten me.

What do you call the tray under the lathe that collects most of the swarf?.

It's a pan for cooking chips.

You are thinking of a swarf tray.

Neil
4 December 2018 at 18:52 #383825
Michael Gilligan
Participant
@michaelgilligan61133
Blimey … there's a helluvan echo in here

MichaelG.
4 December 2018 at 19:01 #383829
RRMBK
Participant
@rrmbk
in the US Chips are our crisps and Fries are our chips. and ive never seen anything yet in my swarf tray / chip pan that looked even remotely edible!!
4 December 2018 at 19:16 #383833
Alan .204
Participant
@alan-204
The needing of three hands is a pain in the you know what when using thread wires, buts there’s another way if your interested, all I do is when I want to measure say an M12 thread I use an already made M12 piece of thread it holds the wires perfectly and you can sort of roll the wires with your thumb and finger if you see what I mean, it’s quit easy compaired to any other way I’ve seen, give it a go you may be surprised.

Alan.
4 December 2018 at 23:09 #383870
John Reese
Participant
@johnreese12848
Great idea, Alan.
4 December 2018 at 23:36 #383873
ega
Participant
@ega
Here is a suggestion from the late Cliff Bower:

An unattended chip pan was the means by which my mother twice set fire to her kitchen.
4 December 2018 at 23:51 #383877
Hopper
Participant
@hopper
I am surprised this many people use thread wires in the home workshop. Why? Is the conventional thread depth calculation plus a bit of "try and fit" at the final stages not precise enough for some types of home shop work? Or is it simply for the joy of knowing that it's "spot on"?
5 December 2018 at 00:09 #383880
not done it yet
Participant
@notdoneityet
As I see it, they are only useful for situations where good thread engagement is required but the two interacting parts cannot easily be test-fitted with each other.
5 December 2018 at 00:12 #383881
Paul Kemp
Participant
@paulkemp46892
Posted by Hopper on 04/12/2018 23:51:11:

I am surprised this many people use thread wires in the home workshop. Why? Is the conventional thread depth calculation plus a bit of "try and fit" at the final stages not precise enough for some types of home shop work? Or is it simply for the joy of knowing that it's "spot on"?

I know not! Plenty of examples on here of people chasing 2/10 of a thou when 2 thou or sometimes even 12 thou would be perfectly acceptable. I imagine there must be a lot of shadow graphs tucked away in strictly temperature controlled garden sheds and the calibration bills for measuring equipment must be horrendous.

Paul.
5 December 2018 at 06:43 #383887
Hopper
Participant
@hopper
Posted by not done it yet on 05/12/2018 00:09:30:

As I see it, they are only useful for situations where good thread engagement is required but the two interacting parts cannot easily be test-fitted with each other.

Even then, I'll usually make a "test bung" and turn the thread to fit that. EG, if turning a chuck backing plate, make a male threaded plug that fits one of the existing chucks nicely, then screwcut the new backing plate until the threaded plug is a nice fit.
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