Exhaust bolts

[fatblokeonbandit]

Ben trying to accurately measure the hole spacing of the exhaust bolts on an B12 head , due to old age wonky eyesight, hangover and the cold I gave up!!!!!!!!!

 

Anyone know for sure how many millymetrics it is please chaps???

 

Merci beaucoup

[Joseph]

Looks like 59mm 

[fatblokeonbandit]

That’s why I asked, to me it looks

like 58 mm, to my mate 59ish

I need an accurate measurement!!

 

[Joseph]

Ok so let me rephrase

I took the time to measure

It measures 59mm

[Devilman]

If you're trying to eye-ball it center-to-center with a pair of calipers, I can see why you're having problems

Just screw a couple of studs into the bolt holes, measure across the outside of both studs, then subtract the diameter of 1 stud.

You now have your center-to-center spacing perfectly

[Joseph]

1 hour ago, Devilman said:

If you're trying to eye-ball it center-to-center with a pair of calipers, I can see why you're having problems

Just screw a couple of studs into the bolt holes, measure across the outside of both studs, then subtract the diameter of 1 stud.

You now have your center-to-center spacing perfectly

Which is still 59mm

[Devilman]

9 hours ago, Joseph said:

Which is still 59mm

Sure is... 

However I was simply providing people with the means to figure it out accurately and reliably themselves should they want to 

Edited December 4, 2022 by Devilman

[fatblokeonbandit]

Well mine must be special then I did a test piece at 59 mm before making the new tool, and the spacing is wrong

so I did one at 58mm and all is well

 

[TonyGee]

what you making Garry ?

Edited December 5, 2022 by TonyGee

[slayer61]

On 12/3/2022 at 8:36 AM, Devilman said:

If you're trying to eye-ball it center-to-center with a pair of calipers, I can see why you're having problems

Just screw a couple of studs into the bolt holes, measure across the outside of both studs, then subtract the diameter of 1 stud.

You now have your center-to-center spacing perfectly

I've always found less math to be easier. Measure from the east side of 1 to the east side of the other & be done.

 

 

And 58, it is. 

Edited December 5, 2022 by slayer61

[davecara]

19 minutes ago, TonyGee said:

what you making Garry ?

I reckon thats a snapped stud driller thingiemajig

[davecara]

Like mine but posher

[fatblokeonbandit]

20 minutes ago, davecara said:

Like mine but posher

That’s the kiddie, been meaning to make one for ages

[davecara]

23 minutes ago, fatblokeonbandit said:

That’s the kiddie, been meaning to make one for ages

I found a spot weld drill was good for flattening the top of a snapped stud, you get to drill it proper then with no slipping

[fatblokeonbandit]

Good idea

ive had good results starting off

with a lathe centre drill

[davecara]

1 hour ago, fatblokeonbandit said:

Good idea

ive had good results starting off

with a lathe centre drill

Must have a hell of a swing on your lathe to spin a whole engine round 

[Wagola]

1 hour ago, davecara said:

Must have a hell of a swing on your lathe to spin a whole engine round 

Cracked me up !!

[bluedog59]

2 hours ago, davecara said:

Must have a hell of a swing on your lathe to spin a whole engine round 

I want to know how you're going to hold it in the chuck !

[Devilman]

12 hours ago, slayer61 said:

I've always found less math to be easier. Measure from the east side of 1 to the east side of the other & be done.

 

 

And 58, it is. 

While fundamentally I agree, in this particular case what you suggest is unlikely / unable to be used.

Calipers cannot measure from "inside" to "ouside" on the same part in the manner you suggest.   They measure outside-outside OR inside-inside, so either way you gotta do some math

[Gixer1460]

Oh yes they can ! Use the depth guage bit, caliper end against one side of 1st hole and depth bit to corresponding other side of other hole - easy!

[Swiss Toni]

I do it Devilmans way. Easiest!

[slayer61]

On 12/5/2022 at 8:20 PM, Devilman said:

While fundamentally I agree, in this particular case what you suggest is unlikely / unable to be used.

Calipers cannot measure from "inside" to "ouside" on the same part in the manner you suggest.   They measure outside-outside OR inside-inside, so either way you gotta do some math

Caliper? What is this "caliper" thing, of which you speak? I build with a tape measure !!!   

[TonyGee]

26 minutes ago, slayer61 said:

Caliper? What is this "caliper" thing, of which you speak? I build with a tape measure !!!   

now thats old school  got to be better than a knotted rope  

[Swiss Toni]

41 minutes ago, TonyGee said:

now thats old school  got to be better than a knotted rope  

Or a pen knife open & shut!

[bluedog59]

There's few things you can't measure accurately enough with the length, width and diameter of your finger(s).