Hi Robert & Scott, The first, a flat sided flat bottomed groove is called a dado. The other, which widens as it approaches the floor of the groove is called a sliding dovetail. The shape is like the fan of a doves tail.
There are saw blades which wobble slightly as you cut. There is a sort of dial which is wedge shaped and can be turned to add or decrease the amount of wobble. These are also called dado blades, are a cheaper method but leave a slightly rounded floor on the dado. A dado blade or set actually, consists of two blades with chippers which are fitted between. These chippers are a double ended sort of chisel, in a set you will have usually three sizes as well as a number of shims which are like washers for spacing the chippers accurately between the blades to give you widths usually up to 13 16ths. Someone earlier was asking about this. You can cut dados with a hand circular saw. I have never done it, there are a couple of limitations, one is the usual length of the mandril bolt, it would be pretty hard to control all that cutting power off to one side of a hand circular saw I would think. When using a router to cut dados you usually select a cutter of the appropriate size, say three quarters of an inch. Depending on the depth you may wish to set partial depth first time through then set it deeper and make the cut in several passes. The axis of rotation of a router is 90 degrees to that of a table saw so the rotation tends to want to pull the router off to one side however the cut is a very clean and sharp one. Worm drive circular saws tend to be more powerful and very hard to bog down. They are also usually quite a bit heavier and much longer so there are balance issues and you want to have pretty good forearms if doing any amount of cutting. They seem to run on average close to about 15 lb. where as a standard sidewinder can be under 10 lb. It is not clear why right sided blades became the more or less de facto standard, anyone sighted who has ever used a left side mounted blade prefers the visibility, you are standing over the site line so the cut is much easier to see with correct parallax. Left handers have known this for years, their trouble is in operating the trigger and lock with their thumb on that side of the handle. While there are more left sided blade saws, saws for left handed people remain rare. I was considering getting one for one of my daughters but haven't so far located a suitable one. Oh yes, there is actually different terminology for a slot running with the grain and one across the grain. I believe the cross grain is a dado but I just forget maybe with the grain it is called a slot. Dale Leavens, Cochrane Ontario Canada [EMAIL PROTECTED] Skype DaleLeavens Come and meet Aurora, Nakita and Nanook at our polar bear habitat. ----- Original Message ----- From: "Robert J. Moore" <[EMAIL PROTECTED]> To: "Blind Handyman" <[email protected]> Sent: Friday, December 29, 2006 3:30 PM Subject: [BlindHandyMan] Dado question >I also have a question about dado cuts > I have 2 grooves pictured in my mind. > one would be simply a groove cut in the board that would be the same width > at the top as at the bottom. for example you could have a groove the > length > of a board that would be 1/4 inches deep and 1/8 inches wide what you > might > find to hold the back panel on a shelf. > the other is harder to explain. > you would have a groove that would be 1/4 inches deep but at the top it > would be 1/8 inches wide and at the bottom of the groove it would be 1/4 > inches wide. > The edge of the joining board would be cut just the opposit this would > mean > you would have to litterally slide the one board into the groove starting > at > one end and the boards would interlock. > So do these have two differant names? And if so what do they call each. > > > > To listen to the show archives go to link > http://acbradio.org/handyman.html > or > ftp://ftp.acbradio.org/acbradio-archives/handyman/ > > The Pod Cast address for the Blind Handy Man Show is. > http://www.acbradio.org/news/xml/podcast.php?pgm=saturday > > The Pod Cast address for the Cooking In The Dark Show is. > http://www.gcast.com/u/cookingindark/main.xml > > Visit the new archives page at the following address > http://www.mail-archive.com/[email protected]/ > For a complete list of email commands pertaining to the Blind Handy Man > list just send a blank message to: > [EMAIL PROTECTED] > Yahoo! Groups Links > > > > > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.409 / Virus Database: 268.15.29/608 - Release Date: > 29/12/2006 > > To listen to the show archives go to link http://acbradio.org/handyman.html or ftp://ftp.acbradio.org/acbradio-archives/handyman/ The Pod Cast address for the Blind Handy Man Show is. http://www.acbradio.org/news/xml/podcast.php?pgm=saturday The Pod Cast address for the Cooking In The Dark Show is. http://www.gcast.com/u/cookingindark/main.xml Visit the new archives page at the following address http://www.mail-archive.com/[email protected]/ For a complete list of email commands pertaining to the Blind Handy Man list just send a blank message to: [EMAIL PROTECTED] Yahoo! 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