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Author: Subject: Boring a hole?
coozer

posted on 19/1/14 at 06:58 PM Reply With Quote
Boring a hole?

I need to enlarge a 38mm hole in my V8 manifold to take a piece of 1.75" tube.

Will a hole saw be accurate enough to ensure a good seal?

Say I run a 44mm hole saw through and use emery paper to enlarge to a nice snugg fit?

Basically I want to replace these tubes with 45mm 60 degree bends..







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gingerprince

posted on 19/1/14 at 07:10 PM Reply With Quote
Based on the subject title I was expecting this thread to be about an exceedingly dull and dislikeable person! (boring a-hole).
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rusty nuts

posted on 19/1/14 at 07:23 PM Reply With Quote
Unlikely to be accurate as a hole cutter relies on a drill bit to centralise the cutter. Scribing around the ram pipes and using a file or die grinder would be better if you have to do the job by hand
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BenB

posted on 19/1/14 at 08:15 PM Reply With Quote
Have you got a 38mm hole saw? If so clamp the workpiece to a big old bit of wood. Put the 38mm bit on the drill, insert into the 38mm hole and therein drill the center hole, swap to the 44mm hole saw and job's a good'un.
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ste

posted on 19/1/14 at 08:30 PM Reply With Quote
If doing the above, when you move onto the bigger hole saw, swap the drill bit in the centre so it faces upwards and the shank of the drill will spin in the hole in the wood and not enlarge it
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theprisioner

posted on 19/1/14 at 08:51 PM Reply With Quote
Clamp on to milling or vertical drill bed and use a Rotabroach. Rotabroach is +/- .25mm depending on well you clamp it possibly use a custom mandrill.





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MakeEverything

posted on 19/1/14 at 09:19 PM Reply With Quote
quote:
Originally posted by ste
If doing the above, when you move onto the bigger hole saw, swap the drill bit in the centre so it faces upwards and the shank of the drill will spin in the hole in the wood and not enlarge it


Or replace said drill bit with a 1/4" rod.

The standard tubes are tapered so you'll need to understand the effects of replacing them with a parallel tube - unless of course youre not worried!





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dave_424

posted on 19/1/14 at 09:30 PM Reply With Quote
I don't know how thick the material is, but would a large step drill work? drill from both sides and grind out any part in the middle that the step drill can't reach
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Talon Motorsport

posted on 19/1/14 at 09:31 PM Reply With Quote
Is that the bottom plate of an injection plenum? If so I have just thrown one in the scrap bin I also own a mill with an adjustable fly cutter.....
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coozer

posted on 19/1/14 at 09:46 PM Reply With Quote
quote:
Originally posted by Talon Motorsport
Is that the bottom plate of an injection plenum? If so I have just thrown one in the scrap bin I also own a mill with an adjustable fly cutter.....


yep, how easy is it to cut?





1972 V8 Jago

Midlana when I find the space...

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Talon Motorsport

posted on 19/1/14 at 09:51 PM Reply With Quote
With the mill it's as easy as it gets, how ever if I remember correctly you are trying to join mild to cast ali?
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coozer

posted on 19/1/14 at 10:08 PM Reply With Quote
quote:
Originally posted by Talon Motorsport
With the mill it's as easy as it gets, how ever if I remember correctly you are trying to join mild to cast ali?


Yep, I'm trying to make a manifold with mild steel. The tubes that are in there are stainless atm, I believe they are glued in..





1972 V8 Jago

Midlana when I find the space...

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Talon Motorsport

posted on 19/1/14 at 10:32 PM Reply With Quote
Just checking...
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bi22le

posted on 19/1/14 at 11:33 PM Reply With Quote
I had to do very similar with an inlet I made. I drew round the tube with a sharpie and dremel out the last 5mm with a metal grinding wheel.

slowly does it but worked a treat.





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redturner
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posted on 20/1/14 at 08:39 AM Reply With Quote
I have a set of commercial vehicle king pin bush reamers which would make a perfect finish. Don't you know any one local who could do it for you.....
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Krismc

posted on 23/1/14 at 07:07 PM Reply With Quote
quote:
Originally posted by gingerprince
Based on the subject title I was expecting this thread to be about an exceedingly dull and dislikeable person! (boring a-hole).


Coozer, I thought it was going to be about a Bore-hole. We just drilled one at work under a shopping centre 36 inch circumference 20 meters deep through rock. Took 4 days none stop.





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