Could an engineer give me a rough price to make this nut?

[barwel1992]

could an enginer give me a ruff price to make this ?

its my axle nut from my front end its custom made so cant just get another one, basically the one i have is steel and rusts alot and axle is alu though so how much would it cost to make one out of stainless steel ?

there is a inner thread not in the image below but the radius is correct then there would have to be a thread tapped in to it its 2mm pitch thread

hears the ruff mock up of the nut at the moment (but without the flat sides or thread) the top radius is the ID of the thread
http://i357.photobucket.com/albums/oo16/barwell1992/axlenut.jpg

this is how the flat sides of nut looks at the moment but i want it to be a 6 sided nut
http://i357.photobucket.com/albums/oo16/barwell1992/axlenutbottom.jpg

six side
http://i357.photobucket.com/albums/oo16/barwell1992/axlenuthex.jpg


and this is the actual nut
http://i357.photobucket.com/albums/oo16/barwell1992/10022011734.jpg

http://i357.photobucket.com/albums/oo16/barwell1992/10022011737.jpg

http://i357.photobucket.com/albums/oo16/barwell1992/10022011735.jpg

http://i357.photobucket.com/albums/oo16/barwell1992/10022011743.jpg

the black bit of pen on the thread gives you an idea of the pitch
http://i357.photobucket.com/albums/oo16/barwell1992/10022011738.jpg

any help appreciated

PS if any one wants to make me one that would be cool and i would send the nut i have so it could be measured properly as long as the price is right :)

thanks

[Spikenipple]

Do you know the actual dimensions of the internal thread? I guess you measured the 8.80 internal rad from the peaks of the thread?

[barwel1992]

Do you know the actual dimensions of the internal thread? I guess you measured the 8.80 internal rad from the peaks of the thread?

yeh, well the thread does not have peaks they are flat but yes 8.8r is the internal thread dimension.

right measured the axle and the threads OD is 19.92 pitch (measured a few times and got 19.80 as well so will double check) still looks like 2mm pitch and id of thread is about 17.8mm

i will double measure tomorrow but im guessing m20 x 2mm pitch

EDIT looking it up again this is what i have in my reference book, for a m20 x 2mm ISO metric special pitch tapping drill sizes

nominal DIA 20.00mm
pitch 2mm
basic major dia 20.00mm
basic effective dia 18.701
basic minor dia of threads
.external 17.835mm
.internal 17.835mm
tapping drill size 18.00mm
clearance drill size 20.25mm

what do you think ? m20x2mm pitch

[sv650nutter149]

message spannerman hes good for things like this

[barwel1992]

my post before has been updated

[yorkie_chris]

Look at the axle with proper pitch gauge and thread angle tool, who knows what they made if it is all custom.

If you're sending it so someone to turn an internal thread into it then better to send them axle so they can screw it in to check for fit.

[AndyBrad]

i thought m20 corse was 2.5mm pitch and fine was 1.5mm pitch? i doubt they would have used a custom thread pitch although i can and often am wrong. :)

why do you want a hex? i would estimate about 25 quid. fint somone with something you can use as a thread gauge!

[DavieSV]

You can guesstimate the pitch with a ruler.

Measure across as many threads as possible on the shaft from peak to peak, then divide that measurement by the number of pitches that you have measured.

A 20mm measurement will give you 10 pitches for 2.0mm pitch or 8 pitches for 2.5mm pitch.

That will be near enough for standard metric threads :D

[DavieSV]

From the photo and the drawing.

If it is 33.3mm long, it looks like it has 13 threads in the nut = M20 x 2.5

Edit, read dimension wrong

[barwel1992]

From the photo and the drawing.

If it is 33.3mm long, it looks like it has 13 threads in the nut = M20 x 2.5

Edit, read dimension wrong

yeh there's 13 threads and its 33.3 long so 2.5pitch will go and check again on the axle

Definatly 2.5mm pitch amazing what a little bit of light has on your eye sight :p

[Spanner Man]

Good afternoon all.


I would say that it could be a 2mm or 2.5mm pitch thread. 2mm is neither ISO metric fine or coarse for a 20mm diameter. Those being 1.5mm & 2.5mm repectively. 2mm would be typically Japanese! (They have a habit of doing such things).:D It's almost certainly metric, due to the flat crests.

It would probably take an hour or two to machine the component. The threading being the tricky part. Also, if you were to want a hex machined onto it, I would have to visit my mate at his 'engineering porn shop' & blag the use of one of his milling machines.

It's always better to have the spindle available, when making such things. As, threads being what they are. If I were to make a perfectly dimensioned internal thread using full form inserts, it probably would be too tight. Hence the need to match the item being made to the spindle it's going to be fitted too.
If it's a 2.5mm pitch one can use a tap to good effect,-bore item to tapping size, bung the tap through, Job done! :-)

Be carefull if using stainless steel. A lot of stainless is pretty soft, & not suitable for an item that will have a high torque on it. I have a lump of (bloody expensive) 40mm diameter S143 grade stainless.This grade is typically used in the Aerospace industry, & would do the job nicely.

Give me a call if you would like a waffle on the subject.


Cheers.

[barwel1992]

cheers for all the help :)

DavieSV is sorting it out for me :)

ps the item is low torque as the forks clamp round the axle all it does is load the bearings

[mikerj]

Good afternoon all.
It would probably take an hour or two to machine the component. The threading being the tricky part. Also, if you were to want a hex machined onto it, I would have to visit my mate at his 'engineering porn shop' & blag the use of one of his milling machines.



Couldn't you just turn it down from some hex bar stock to avoid milling?

[Spanner Man]

Couldn't you just turn it down from some hex bar stock to avoid milling?


One could. But where's the fun in that!:D


Cheers.