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Odd-sized coin inlay

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Forum topic by DRStevick posted 12-23-2011 07:59 AM 2073 views 0 times favorited 5 replies Add to Favorites Watch
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DRStevick

30 posts in 1845 days


12-23-2011 07:59 AM

Topic tags/keywords: cribbage purpleheart koa maple inlay coin forstner

I have been asked to make a cribbage board as a going away gift. The cirgular inserts in the center of the board are for various coins. Unfortunately, the coin sizes are pretty much random, and the need to be arranged in a particular order.

1) Does my design accentuate the fact that the coins are different sizes? It would be different if they were arranged smallest to largest, or largest in he center, but they aren’t, and can’t be. Is there any way to de-accentuate this?

2) The coin sizes themselves are an issue, as far as bits are concerned. One is 1 1/2”, one is 1 3/4”, one is 40mm, one is 45mm. These are OK – I had the imperial sizes, and I was able to find the two metric sizes. However, one is 46mm – although I can’t find this one, I was amazingly able to find a 1 13/16 bit, which are nearly identical. The problem is the last two, which are 44mm. The 1 3/4” bit is the closes I can find, but it’s going to be a bit off. Does anyone have any suggestions as to sizing the 44mm hole?

Thanks for looking; I’ll make sure to post pictures when I’m done! By the way, the board will be in curly koa, with a purpleheart and maple insert on top, and a maple frame on the bottom. The board will be hinged with a set of barrel hinges for card and peg storage.


5 replies so far

View mtenterprises's profile

mtenterprises

933 posts in 2158 days


#1 posted 12-23-2011 08:14 PM

When I needed an odd sized hole for some project that cannot remember I bought an oversized forstner bit took it to work and spun it down on the tool grinder. This is not a pedestal grinder, you chuck the bit up in a motorized rotating head and spin it against the spinning grinding wheel. This is VERY accurate if done correctly and can make parts within 0.0001”. If you could find a machine shop in your area that does grinding and will do the job for you you can have any size you want. A metal lathe with a tool post grinder could do almost as good of a job depending upon who is doing the work. Just my suggestions.
MIKE
And a Merry Christmas to you.

-- See pictures on Flickr - http://www.flickr.com/photos/44216106@N07/ And visit my Facebook page - facebook.com/MTEnterprises

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racerglen

3112 posts in 2246 days


#2 posted 12-23-2011 08:28 PM

Another answer is the adjustable bit, they’re available in hand drill, as in brace, and power varieties.
Although you might have to go second hand store-flea market shopping for the hand type ?

And the best of the season to all

-- Glen, B.C. Canada

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poopiekat

4225 posts in 3200 days


#3 posted 12-23-2011 09:12 PM

I’m with racerglen on this, by using a Irwin expansion bit I was able to make perfect, press-fit holes for some coins. Just size it up with scrap stock each time you adjust. It’s perfect for this type of work.

-- Einstein: "The intuitive mind is a sacred gift, and the rational mind is a faithful servant. We have created a society that honors the servant and has forgotten the gift." I'm Poopiekat!!

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mtenterprises

933 posts in 2158 days


#4 posted 12-24-2011 05:31 AM

I have too many tools I forgot I have one of those bits.
MIKE

-- See pictures on Flickr - http://www.flickr.com/photos/44216106@N07/ And visit my Facebook page - facebook.com/MTEnterprises

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DRStevick

30 posts in 1845 days


#5 posted 12-24-2011 06:01 AM

Awesome… I had never heard of an adjustable bit like that before! Thanks! Oh – and while I was searching for an “adjustable forstner bit” before I saw the specific name, I found a site that had 44mm and 46mm bits. But, I think I’ll go with the adjustable. Just wish I had seen this before I bought the other 3 bits already!

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