Author Topic: Need to drill a 6 in deep 3 1/8 in diam hole  (Read 4155 times)

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Offline Zacharytanner

  • Posts: 568
Need to drill a 6 in deep 3 1/8 in diam hole
« on: September 08, 2015, 07:57 AM »
Guys
My wife wants a log vase. The glass vase insert is 3 inches so I want to drill/route a 3 1/8 inch hole 6 inches deep?

I don't have a large enough forstner bit and I don't have a long enough router bit?

Any thoughts

Best
Frank
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Frank

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Offline bkharman

  • Posts: 1983
Re: Need to drill a 6 in deep 3 1/8 in diam hole
« Reply #1 on: September 08, 2015, 08:00 AM »
You could get a machine shop to do it. You could also split the block in half, gouge out the material and glue it back together.

Cheers. Bryan.
People, I just want to say, you know, can we all get along? Can we get along?

Offline Ed Bray

  • Posts: 411
Re: Need to drill a 6 in deep 3 1/8 in diam hole
« Reply #2 on: September 08, 2015, 08:16 AM »
What diameter is the log, could you not find a friendly woodworker with a lathe? They could do that in no time at all.

Offline jonny round boy

  • Posts: 3227
Re: Need to drill a 6 in deep 3 1/8 in diam hole
« Reply #3 on: September 08, 2015, 08:33 AM »
There's a few companies that make forstner bits that size. They're a bit pricey, but I've just found some on eBay UK at 90mm, by Milwaukee, for less than £37GBP. Should easily be able to pick one up over there for less than 50 bucks.

If you don't want to buy a bit, then the only other way I could think of doing it would be with a holesaw - cut 1" deep, chisel out the waste, drill another 1", chisel out the waste, and so on. The length of the holesaw and the chuck/front of the drill would fit within that diameter, so you should be able to get to 6" deep that way. It would be very time-consuming though, and the finish inside the hole wouldn't be great (don't know if that'd be a problem for you or not).

But like Ed said, if your stock would fit on a lathe (and you have access to one) that might be the easiest way.


Edit: There are plenty of 3 1/8" bits on eBay US, from $12 - $25: http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2053587.m570.l1313.TR3.TRC2.A0.H0.X3+1%2F8%22+forstner+bit.TRS0&_nkw=3+1%2F8%22+forstner+bit&_sacat=0
« Last Edit: September 08, 2015, 08:40 AM by jonny round boy »
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Offline Birdhunter

  • Posts: 2361
  • Woodworker, Sportsman, Retired
Re: Need to drill a 6 in deep 3 1/8 in diam hole
« Reply #4 on: September 08, 2015, 08:46 AM »
I made about 20 log vases for a ladies charity. One of the ladies had a tree cut down on her property and had the 20 sections cut from limbs. The sections were about 8" in diameter and about 12" long. I don't remember what type of tree, but the wood was hard although very green.

I mounted the log sections on a lathe faceplate getting them as centered and trued as possible.

I started the hole using a 1 1/2" Forstner drill bit.

From there, I used bowl cutters to hollow out the hole for the vases. The vases were 3" in diameter and about 5" deep.


I had to keep the speed down so as to avoid "throwing" the log section. Very tricky.

Birdhunter

Offline ifit

  • Posts: 228
Re: Need to drill a 6 in deep 3 1/8 in diam hole
« Reply #5 on: September 08, 2015, 10:21 AM »
You could do it with a hole saw and chisel out the plug - it might be a time consuming job cleaning it up though

Offline Cheese

  • Posts: 5067
Re: Need to drill a 6 in deep 3 1/8 in diam hole
« Reply #6 on: September 08, 2015, 11:45 AM »
I've done the hole saw thing in fir before. I drill down to the full depth of the hole saw, 1 1/2" - 1 3/4" depending upon how much of the arbor protudes inside the hole saw, take a 1/4" stainless rod, place it in the pilot hole that was drilled and then force it from side-to-side until the hole saw plug breaks off. If it's particularly stubborn (or if it's too green), I'll take a long taper punch, place it in the pilot hole and hammer it into the plug, a miniature version of log splitting if you will. You'll always be left with some vestige of the pilot hole remaining, so just go back at it until you get the depth you need. The only downside is that the interior walls will be quite rough and you'll probably want to get a reasonably flat bottom on the hole.

Offline Bohdan

  • Posts: 885
Re: Need to drill a 6 in deep 3 1/8 in diam hole
« Reply #7 on: September 10, 2015, 05:59 AM »
If you use one of the new TCT hole saws, some of them are quite deep, you will get a much better finish to the edges of the hole.

Offline Cheese

  • Posts: 5067
Re: Need to drill a 6 in deep 3 1/8 in diam hole
« Reply #8 on: September 10, 2015, 11:49 AM »
If you use one of the new TCT hole saws, some of them are quite deep, you will get a much better finish to the edges of the hole.

Who makes the TCT hole saw?

Offline Rusty Miller

  • Posts: 240
Re: Need to drill a 6 in deep 3 1/8 in diam hole
« Reply #9 on: September 10, 2015, 05:12 PM »
Birdhunter, it also helps having that Oneway!  Super good lathes.

Rusty
Rusty Miller
I'd rather be woodworking!

Offline Bohdan

  • Posts: 885
Re: Need to drill a 6 in deep 3 1/8 in diam hole
« Reply #10 on: September 10, 2015, 07:29 PM »
If you use one of the new TCT hole saws, some of them are quite deep, you will get a much better finish to the edges of the hole.

Who makes the TCT hole saw?

They are sold under various brands> Here is a YT clip from an Australian brand.



I am sure that if you google TCT hole saw you will get lots of suppliers.

Offline mwildt

  • Posts: 420
Re: Need to drill a 6 in deep 3 1/8 in diam hole
« Reply #11 on: September 10, 2015, 07:43 PM »
There are extensions for Forster bits available. Different lengths, like this 12 inch one:

http://www.amazon.com/Vermont-American-17104-Standard-Extension/dp/B00078JYD4/ref=pd_bxgy_469_text_y

Offline Cheese

  • Posts: 5067
Re: Need to drill a 6 in deep 3 1/8 in diam hole
« Reply #12 on: September 10, 2015, 10:05 PM »
@ Bohdan
Thanks for posting the video. TCT...tungsten carbide teeth...duh [embarassed]

Three things from the video:
1. The amount of different materials it can cut through because of the carbide teeth.
2. The additional cut depth of the hole saw.
3. The ease of mounting the hole saw on the hole saw shaft.

I also liked the mounting of 2 different hole saws on the same shaft for increasing the size of the original hole. Starrett offers an "oops" adapter that works in the same manner, unfortunately it only works with a lot smaller diameter series of hole saws.


Offline tjbnwi

  • Posts: 5733
  • Cedar Tucky Indiana
Re: Need to drill a 6 in deep 3 1/8 in diam hole
« Reply #13 on: September 10, 2015, 10:30 PM »
Drill press on medium speed, clamping device, 3-1/8" or 3-1/4" Fostner bit. No clearing of the slug, flat bottom. I don't think you'll need an extension because the chuck will enter the hole.

If I can drill 36 glass volute candle vessels (72 holes) on a drill press I'm sure you can drill the log vase.



Tom
« Last Edit: September 10, 2015, 10:34 PM by tjbnwi »