View Full Version : Bat's ears in dado cuts?
ian maybury
06-22-2012, 9:09 PM
The Forrest Dado King thread and my present interest in the topic prompted the thought: is there any way around the issue of grooves caused by the bats's ears when using repeated passes with a dado set to cut a tenon?
Is it a case of reverting to the router table where this is an issue?
ian
joe milana
06-22-2012, 9:26 PM
I suppose you could send them to the sharpener & have the "ears" ground off, but why bother. They are pretty insignificant, especially on a tennon. Tennons on the router table....yuk.
ian maybury
06-22-2012, 9:29 PM
I agree Joe that the router table doesn't appeal. I was thinking of say a bridle joint situation where the sides of the tenon are visible.....
joe milana
06-22-2012, 9:37 PM
I'd have to say that there are better ways to cut a tennon than with a dado blade anyway. tennoning jig, bandsaw, shoulder plane, etc.
Phil Thien
06-22-2012, 9:37 PM
How about using a tenon jig on the table saw? The cheeks are cut w/ the blade, so no bat ears?
scott spencer
06-22-2012, 10:24 PM
The box joint sets tend to have flat ground teeth, which leave no bat ears.
ian maybury
06-22-2012, 10:43 PM
Thanks guys. My lack of experience is coming through here in that my shop is just nearing completion after more than a year of work.
I've actually got the option to go the bandsaw, router table or table saw routes - the coming months are going to see a fairly steep learning curve.
That's good news - it tends to suggest that the primary role for a dado slot is perhaps rebates and long slots - in which case the bat's ears are not really an issue....
I'll take a look at the box joint sets too Scott.
ian
Mike Heidrick
06-22-2012, 11:45 PM
Try one with the DK - I doubt you will see anything - the grooves will be on the inside.
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