The10.5mm Fisch drill bit that I am using actually measures 10.48 mm the brass Sierra tubes vary between 10.53 and 10.56 so it's only a smidgein' and by sanding down the tube and reaming out the hole in the blank I can get them to eventully fit. Thing is these are spare tubes bought from TB to replace the tubes that I got with the kits which were also too big . Will mention it to David when I next order.
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Weekend in the Shed
- Thread starter Jim
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The10.5mm Fisch drill bit that I am using actually measures 10.48 mm the brass Sierra tubes vary between 10.53 and 10.56 so it's only a smidgein' and by sanding down the tube and reaming out the hole in the blank I can get them to eventully fit. Thing is these are spare tubes bought from TB to replace the tubes that I got with the kits which were also too big . Will mention it to David when I next order.
Neil
Fellow
Ed,
I have bought over 500 sierra kits in the last year and never have I had a problem with tube sizes. Inevitably there are dimensional tolerances in the construction of the tubes, these tolerances should be consider when the pen is designed, the taper of the section onto which they are compressed and the malleability of the tube itself.
The specified tube, as you will know requires a 27/64 drill bit. The metric conversion of this is 10.72mm. I have never had a problem with sierra tubes when using the imperial drill bits. I don't mean to point out the obvious but there is no way that a 10.5mm drill is going to work satisfactorily.
I have bought over 500 sierra kits in the last year and never have I had a problem with tube sizes. Inevitably there are dimensional tolerances in the construction of the tubes, these tolerances should be consider when the pen is designed, the taper of the section onto which they are compressed and the malleability of the tube itself.
The specified tube, as you will know requires a 27/64 drill bit. The metric conversion of this is 10.72mm. I have never had a problem with sierra tubes when using the imperial drill bits. I don't mean to point out the obvious but there is no way that a 10.5mm drill is going to work satisfactorily.
Jim
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Neil
Fellow
But here may lay the issue Neil, on TB he recommends a 10.5 drill ...
Jim,
The recommendation is cobblers! If you use a 27/64 the problem will, I said confidently, go away! I'll post my opinion and justification tomorrow when I get back from the wood turning club and can dig out the manufactured sizes of brass tubing to prove a point.
Jim
Grand Master
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I am not disagreeing with you Neil, i am pointing out that these issues may be happening if customers are buying the 10.5 drill bits unaware that the bit is too small ...
Not to sound soft in the head or anything, but would an 11mm not do in a pinch? I know that there are those who believe the tube may be loose or become misaligned, but I can say hand on heart that I have never had any of those problems.
Well I guess I must be just lucky I have used 10.5 with no problems at all but we will see on this new lot santa brung me talking of which I'm off now to rearrange my work shop to get all my new goody's in ohhhhhhhhhh its a hard life
Penpal
Grand Master
I would be interested what actual size the hole is with a 10.5 bit they normally are quite slack and not a tight 10.5 as we would think. As previously stated on the forum I do mike my drills and never believe no matter how much I pay for drills they vary.
What started me on this exercise was trying to get a snug fit mandrel mating hole for mandrel saving I ended up getting a tight fit and easing it useing a smaller end mill kicked over in the tool holder and skin skimming until it felt right, worked for me.
Timbers vary like crazy as well I swear some close up a bit after drilling I find this all the time when I glue up a hundred or two blanks especially if I drilled them a while before use, the weather dry timber? etc.
Interesting is it not.
Kind regards Peter.
What started me on this exercise was trying to get a snug fit mandrel mating hole for mandrel saving I ended up getting a tight fit and easing it useing a smaller end mill kicked over in the tool holder and skin skimming until it felt right, worked for me.
Timbers vary like crazy as well I swear some close up a bit after drilling I find this all the time when I glue up a hundred or two blanks especially if I drilled them a while before use, the weather dry timber? etc.
Interesting is it not.
Kind regards Peter.
I find if it is a hot day and I drill to many out before fitting the tube the wood will sometimes move so that the hole is not symmetrical this of course as Peter says depends on wood type as well so they need re-drilling so I only drill about 4 or 5 at a time and then glue them up this also gives the wood time to cool down after drilling which dose help if you are using CA glue as the warmth from the wood will make the super glue set faster
I tend to measure the outside of the tube with calipers & then pick a drill bit just a smidgen bigger, that way it doesn`t matter if the tubes a little bit over sized it will still fit in the hole.
If I`ve spent a lot of time making up a blank I will take no chances & measure the bushes & the parts of the kit as well as the tubes to make sure everything is as it should be.
If I`ve spent a lot of time making up a blank I will take no chances & measure the bushes & the parts of the kit as well as the tubes to make sure everything is as it should be.
Jim
Grand Master
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Well i am looking forward to visiting the shed this weekend, i was working odd hours over Christmas overseeing some maintenance work, on 2nd we were back in full production, due to issues I ended up working two 15 hour shifts ... Back to normality now, so if i missed some of your posts please forgive me as the eyes and brain weren't working very well when I got home, all i wanted was food and sleep... 
I'm having a big tidy up and a bit of a reorg 
I did get in on NYD and will post the pics later on of Mk I bowl attempt.
I did get in on NYD and will post the pics later on of Mk I bowl attempt.
Sympathise with you Jim, been there done that...
24/7 production sucks....
I'm taking down the rest of the Christmas decks down, just come in to dry my webbed feet..crap weather...
then got a job this afternoon in a physiotherapy clinic doing some jobs ready for the launch.. And then some more jobs tomorrow on sons bungalow..
So no shed for me this weekend..
Bless ya dad have a day off init?
Go pub for a spot o lunch and a bevy or 5.
Love you mate, take care.
Cant go for a pub lunch Violet is cooking my steak and chips LOL and I aint missing that
Well this is what I have been making to feed a work party tomorrew to clean up mountain bike trails after the storm of tye last weeks
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