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3 Posts
Discussion Starter · #1 ·
Ruler Wood Thumb Gesture Finger

old hand with a new toy...
this is maddening...

what is this gap a symptom of ???...

I’m utilizing the supplied 3/8”O.D. Collet...
with 9/32” 7° Dovetail Cutter...
with the Miniature Half-Blind Dovetail Template....

my depth is spot on...
but... as you can see in the photo...
the results are consistently too loose...
there is a gap of approximately 1/32”...

my first thought was that the template is mis-milled... (highly unlikely)...
I checked each tooth anyway... 3/8” throat with 1/8” finger... (perfect...)
I checked the dimensions of the O.D. of the Collet... 3/8”... (perfect....)
I checked the dimensions of the Cutter... 9/32”... (perfect...)

does anyone have an insight on this?...
please/ thanks in advance....

Official Greeter
11,161 Posts
Previously welcomed you in your other post. In regards to this post I’m sure someone will be along in due course to lend you a hand.

715 Posts
Hi Splinter Maker,
In general, the type of jig you have is a bit finicky to set up, but ok once set up.
Firstly, are both pieces of wood the same thickness? If not, the jig usually requires some adjustment. Involves moving the template on the top of the jig out (towards you) or in (away from you). The manual will give explicit instructions.
Secondly, the bit cutting depth given, is a starting point - it has to be raised or lowered, to adjust the fit. Again, consult the manual. I suspect this may be your problem.
Thirdly the piece you place in the jig vertically, has to be offset by a specified amount, in relation to the horizontal piece (I take it you are routing the two together?). The jigs often come with a bushing to achieve the offset, but even then, some finessing may be needed.

1,773 Posts

Glad you have the answer... Like said a finicky jig... unless you have a good memory make detailed notes, it helps me.

39 Posts
Got it!!!...
the problem is...
I’m trying to cut half-blind dovetails
in 3/8” stock... (duh)...
Minimum thickness for half-blind is 1/2”...

I reset the set up for full through dovetails...
Much Love... First Go!!!...
View attachment 397995
I can appreciate your frustration, albeit you are past that point now whereas I am going through it. I have enough scrap that were I to start a fire with it I would raise the overall temperature of the Earth by 10F.

I have the Porter Cable 4216 Jig and am working with 1/2" stock. Initially when following Porter Cables instructions for lining up the "patented" lines over where the horizontal and vertical boards meet there was tremendous play between the two pieces. PC's remedy for this is to move the template towards you for a tighter fit and away from you for a looser fit.

I did that on the the Tail and Pins and overshot the amount of movement because now you couldn't join them together with a sledge hammer. I adjusted for the Tails and kept the distance for the Pins the same. Not sure if that was the correct thing to do.

Then I read that adjusting the routers depth of cut will in so many words accomplish the same thing. Is this correct? And if so, how much do you want to adjust the depth of cut?

Lastly, which method do you try first?

As always, thank you.


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