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- Message-ID: <WOODWORK%92111612585879@IPFWVM.BITNET>
- Newsgroups: rec.woodworking
- Date: Mon, 16 Nov 1992 12:26:30 EST
- Sender: Woodworking Discussions <WOODWORK@IPFWVM.BITNET>
- From: Jim Morgan <JMORGAN@BROWNVM.BITNET>
- Subject: Re: Router Table Inquiries
- Lines: 80
-
- >Posted on 16 Nov 1992 at 08:20:30 by Bob Haar
- >
- >Re: Router Table Inquiries
- >
- >Date: Mon, 16 Nov 1992 13:12:14 GMT
- >Reply-To: rhaar@albert.cs.gmr.com
- >From: Bob Haar <rhaar@ALBERT.CS.GMR.COM>
- >
- >In article 15620@adobe.com, bennett@adobe.com (Bennett Leeds) writes:
- >|>Stan Armstrong writes
- >|>> If it is ease of cutting mortises you are after, consider one of the
- >|>> horizontal router mounting jigs that allow you to mount your router
- >|>> at the back of the table with the bit parallel to the top. The
- >|>> height of the bit above the table is regulated by swingine the router
- >|>> about a pivot. This would let you use your plunge capability and
- >|>> thus eliminate the need to pivot the workpiece.
- >|>
- >|>So, we clamp the wood to the table, plunge the router horizontally,
- >|>then unclamp the wood so we can slide it along the vertical fence,
- >|>then clamp the wood back down, and then unplunge the router?
- >|>
- >|>Sounds awkward to me.
- >|>
- >|>And, if you don't clamp the wood down, you've got to have a hand holding
- >|>it while you use the other to plunge the router in.
- >|>
- >|>Sounds dangerous to me.
- >|>
- >
- >I am not sure about the mortising table design Stan was discussing,
- >but I built one from the WoodSMith plans. In this one, you
- >don't plunge the router, you move the wood.
- >
- >The big advantage of this setup is that the work piece is resting flat
- >on a table surface. This makes it much easier to control. And you can
- >clamp temporary guides pieces to the table to act as stops.
- >
- >
- >---
- > Robert Haar InterNet : rhaar@gmr.com
- > Computer Science Dept., G.M. Research and Environmental Staff
- >DISCLAIMER: Unless indicated otherwise, everything in this note is
- >personal opinion, not an official statement of General Motors Corp.
-
- Well, I'll weigh in on Bennett's side here - the horizontal mortising jig
- (BTW, Spielman describes one in 'Router Jigs & Techniques') seems dangerous
- to me, given that the bit is completely exposed. Also, in feeding the wood
- into the bit, you still have the arcing problem I was concerned with in my
- earlier post - you need to hold the board against a fence at one end and
- pivot it into the bit in order to have any control.
-
- On the other hand, it's not too difficult to solve a problem that Bennett
- brought up about beginning and ending stops for mortises on long boards.
- I built a jig that had a base board with a hinged outlier and a second board
- with two 'feet' that fit around the base board. In use, the base board
- is clamped to the router table so that the wood to be mortised is held
- snugly between the base board and the router table fence. The base board
- is adjusted along the fence so that when the hinged piece is down, the
- board is located at the beginning of the mortise (The hinged piece is angled
- at about 7 degrees to compensate for the arcing problem). The second piece
- is adjusted and clamped so that the foot on the side of the fence provides
- a stop for the end of the mortise. To cut the mortise: the hinged piece is
- flipped down, and the wood is lowered into position against the first stop
- (the angle forces the wood _backwards_ at the bottom of the arc, ensuring, in
- theory a square-sided mortise). Then, the hinged stop is flipped up, and
- the wood is slid over to the end stop. Then the wood is pivoted up, using
- the stopped end as the pivot end, again ensuring a square-sided mortise.
-
- I think that this system is superior to the wood-attached mortising jig/
- hand-help plunge router solution that Bennett suggested for two reasons:
- the router table provides a stable surface for the wood, and my jig needs
- to be set up only once for production runs. On the other hand, I find that
- my mortises do tend to come out belled on the ends, which is the reason I
- was thinking about a treadle mechanism for raising the plunge router.
- Wood for a treadle, a couple pulleys, some cable, and a locking mechanism
- (that's the bit I'm need help with) should cost less than $50 - considerably
- less than the commercial systems Bennett mentioned.
-
- Jim Morgan
- James_Morgan@brown.edu
-