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Reamer for tapered end pin
http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=41933		 Page 1 of 1
Author:  SteveSmith [ Wed Nov 13, 2013 9:50 pm ]
Post subject:  Reamer for tapered end pin
I need to install a bone end pin from LMI. It looks like it has a 3 degree taper. My Stewmac reamer is undersized by about 0.040" Dia. Any recommendations for something that will do the job?
Author:  Tom West [ Thu Nov 14, 2013 5:19 am ]
Post subject:  Re: Reamer for tapered end pin
Steve: If you have a friend who is a machinist ask about a tapered pin reamer. They come in increasing sizes, and one will be big enough, but I can't recall the taper. I'm quite sure it will be close if not right on. Try in scrap first of course.
Tom
Author:  Colin North [ Thu Nov 14, 2013 5:40 am ]
Post subject:  Re: Reamer for tapered end pin
You could enlarge the hole, or, if acceptable, reduce the end pin diameter by 0.040"
Author:  SteveSmith [ Thu Nov 14, 2013 6:19 am ]
Post subject:  Re: Reamer for tapered end pin
I was thinking, I suppose, that there was yet another, larger, 3 degree reamer out there that I would need. Perhaps Colin's idea is the best. I can just work it down with a file and sandpaper till it fits.
Author:  Colin North [ Thu Nov 14, 2013 6:53 am ]
Post subject:  Re: Reamer for tapered end pin
As an alternative suggestion, you might work the reamer slightly further in, then taper/enlarge the outer, parallel part of the hole to fit the end pin, say with needle files/cone of abrasive on the pin itself??.
You could try that on a scrap block to see how it goes?
Alternatively, LMI say
Quote:
The SPRM2 reamer
works great with our endpins.
Author:  Clay S. [ Thu Nov 14, 2013 10:03 am ]
Post subject:  Re: Reamer for tapered end pin
You could grind a flat reamer from a file. If it is good enough for making woodwinds it should be good enough for end pin holes.
Google "Trevor Robinson reamers" then look for the entry "The amateur wind instrument maker" page 15.
The rest of the book is also very good for those who are interested in woodwinds.
Author:  Tom West [ Thu Nov 14, 2013 10:45 am ]
Post subject:  Re: Reamer for tapered end pin
Clay S. wrote:
You could grind a flat reamer from a file.

Before I had bridge pin reamers, this was what I used. Some folks try to use the tang of the file but that is too soft. Small 6" or so, grind taper and sharpen one edge and round the other. I had long forgotten about it.
Tom
Author:  Tai Fu [ Thu Nov 14, 2013 10:52 am ]
Post subject:  Re: Reamer for tapered end pin
If it is a 5 degree taper I was going to recommend the Stewmac endpin jack reamer... it has a 5 degree taper all the way to the endpin jack diameter.

I really wish there's a flat on the reamer shank so I can mount a handle on it. There's time when I don't really want to use it in a power drill.
Author:  Tom West [ Thu Nov 14, 2013 11:00 am ]
Post subject:  Re: Reamer for tapered end pin
Tai Fu: If you have a good grinder it's not hard to put two opposite flats so that you could put on a handle or use a small spanner.
Tom
Author:  Tai Fu [ Thu Nov 14, 2013 11:02 am ]
Post subject:  Re: Reamer for tapered end pin
I don't have a grinder, but I have the stone I use for the wagner safe T planer... I tried drilling it, the material is so hard that the drill bit couldn't even scratch it...
Author:  Stuart Gort [ Thu Nov 14, 2013 11:42 am ]
Post subject:  Re: Reamer for tapered end pin
http://www.mcmaster.com/#taper-reamers/=pdl2py
Author:  DennisK [ Thu Nov 14, 2013 11:55 am ]
Post subject:  Re: Reamer for tapered end pin
Try a violin peg reamer. I bought one of the boxwood end pins from LMI to test with it a while back, and it fit nicely. Never actually installed it in a guitar, but good to have around and ready incase I ever sell one to someone who wants and end pin.

Reamers are pretty pricey though, so if that's all you need it for, see if you can find anyone else in the area who has one (if not an individual, try a violin shop) and will let you use it for a couple minutes. Bring a pre-drilled scrap to test first, of course.
Author:  Joe Beaver [ Thu Nov 14, 2013 1:05 pm ]
Post subject:  Re: Reamer for tapered end pin
Stuart,
My trig is not what it once was. Any clue as to which would be a 3 and 5 degree?
Author:  Stuart Gort [ Thu Nov 14, 2013 1:47 pm ]
Post subject:  Re: Reamer for tapered end pin
Joe Beaver wrote:
Stuart,
My trig is not what it once was. Any clue as to which would be a 3 and 5 degree?


Joe...I guess the only one on that page with a three degree taper is 3018A5 (bottom / right corner of the page). All the rest are a 1/2 degree to 1-1/2 degrees. There are no five degree tapers.
Author:  Joe Beaver [ Thu Nov 14, 2013 3:02 pm ]
Post subject:  Re: Reamer for tapered end pin
Thank you Stuart
Author:  SteveSmith [ Thu Nov 14, 2013 6:26 pm ]
Post subject:  Re: Reamer for tapered end pin
Thanks Stuart, that one is not too expensive.

And thanks everyone for the good ideas!!
Author:  Tim L [ Fri Nov 15, 2013 1:28 am ]
Post subject:  Re: Reamer for tapered end pin
FWIW All of the end pins I have seen are a 5 degree included angle. Been making them for over 10 years for new and after market guitars, for guys who build 10 a year and for guys who build over 600 a year. Martins included. Buy a StewMac reamer and it will last a lifetime, or you can use it for 5 years and resell for what you paid after inflation kicks in. You want your end pin to either fit very snug or with epoxy filler gaah . Cost of a reamer for the proper fit is way cheaper than fixing a guitar that cracks its lower bout because the end pin released, plus you can buy a new end pin anywhere rather than having them custom made.

Tim
Author:  SteveSmith [ Sat Nov 16, 2013 11:32 am ]
Post subject:  Re: Reamer for tapered end pin
I checked this one it was 3 degrees. I just ran the SM reamer in a bit deeper and then used the reamer like a rotary scraper on the flat that was left near the opening. Worked great. Thanks again everybody for the suggestions! This one is finished so I'll post a few photos later.
Author:  Tom West [ Sat Nov 16, 2013 2:51 pm ]
Post subject:  Re: Reamer for tapered end pin
Steve: I no longer use end pins. I install a pickup jack incase someone want a pickup and less chance of damage from an accident. Just my choice of course.
Tom
Author:  SteveSmith [ Sat Nov 16, 2013 3:14 pm ]
Post subject:  Re: Reamer for tapered end pin
Tom West wrote:
Steve: I no longer use end pins. I install a pickup jack incase someone want a pickup and less chance of damage from an accident. Just my choice of course.
Tom


Usually what I do too; normally a K&K Pure Mini. In this case it's a parlor type guitar and not likely to need a pickup. I just like the look of the bone end pin, I suppose.
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