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  Transom drifts--bit size?

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Author Topic:   Transom drifts--bit size?
Sam
Valued Junior Member

Posts: 2
Registered: Aug 2006

posted 06-27-2007 03:55 PM     Click Here to See the Profile for Sam   Click Here to Email Sam     Edit/Delete Message   Reply w/Quote
I'm using african mahogany for the transom, with 1/4" drifts. The book says to experiment with the drill bit size. 1/4" might be too big. Who's used what out there for drilling the drift holes?

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Admin5
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posted 06-27-2007 06:32 PM     Click Here to See the Profile for Admin5   Click Here to Email Admin5     Edit/Delete Message   Reply w/Quote
Try drilling thru a test piece of the African Mahogany. The drifts should fit snugly and be driven into place but not with extreme force. The end of the drift should be filed round and can be rubbed with soap or wax to lubricate.

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Tom Flatley
Builder

Posts: 43
Registered: Aug 2005

posted 06-29-2007 09:04 AM     Click Here to See the Profile for Tom Flatley   Click Here to Email Tom Flatley     Edit/Delete Message   Reply w/Quote
I dont' have the bit handy but I want to say it was 3/16. I do remember going through a couple of sizes before I got it right. I tried regular size bits first, then went and bought the long one. It should be tight enough to just tap it in with a hammer, shouldn't slide or force it.

Remember to drill a little long so you don't botttom out the drift and crack the wood. I laid out all the pins on the pattern so I know where everything is when I drill for hardware and tiller.

Also, be careful when you put the second half of the wood on the drifts. The drifts are already set in one side and when you tap the other side on it can still push the drifts deeper into the first half.

it's great having a big slab of mahogany together when your finished...

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William Fisher
Builder

Posts: 51
Registered: Sep 2003

posted 06-30-2007 01:09 AM     Click Here to See the Profile for William Fisher   Click Here to Email William Fisher     Edit/Delete Message   Reply w/Quote
I looked up my build notes to make sure my memories are clear, I used a ¼” drill bit for ¼” bronze rod.

As the others have posted you should:

1). Make sure the holes are longer than the drifts or you will split the plank.
2). Check the plan drawing for the locations of the drifts.
3). Test bore the holes on mahogany cutoffs. Don’t use different wood, like pine (which is cheaper I know), because the bores will come out different on woods that have different densities. It a shame I know to waste good mahogany but you may get a different fit on softer woods.
4). Bore from both sides of the plank. Any errors will be smaller if you only bore half way through the plank. You must make very accurate layout lines of course.
5). I read opinions on driving the drifts dry and with a light epoxy coat. I drove mine dry and think the drifts have plenty of bite. I doubt they will loosen.
6). Round the leading end so it drives cleanly. I didn’t on the first one and it stuck, luckily only a few inches in so I was able to remove it and file down the ends.
7). I used a combination of driving with a hammer and using the clamps to pull the planks together. Basically I used the drifts to connect any two planks together and then used the clamps to pull those planks together.
8). Although you didn’t ask, I highly recommend dry fitting the planks together and use registration marks on the planks once your happy with the fit. But don’t install the drifts until your ready to commit to assembly! Once my planks were fully assembled I would not have been able to pull them apart with out causing damage. I hardly needed to clamp them to allow the epoxy to dry.
9). I was very nervous about boring the holes and blowing out the side of the plank, and I’m sure that’s a real risk, but I found that because I laid out the drift positions, made accurate layout lines, dry fit until I was happy and took lots of time (I spent 3 nights dry fitting everything, anal retentive I know) it went very well and wasn’t scary at all.

Good luck.

Bill

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Sam
Valued Junior Member

Posts: 2
Registered: Aug 2006

posted 07-06-2007 06:33 PM     Click Here to See the Profile for Sam   Click Here to Email Sam     Edit/Delete Message   Reply w/Quote
1/4" did work OK during my test--tighter than I expected but the lube made a difference. Thanks all for the great advice.

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