How to use Delta 34-172 Tenoning jig
I have (most) of a Delta 34-172 tenoning jig – one of the old cast iron ones that weigh a ton – a local auction find. It has a replacement sole plate which is altogether wrong, but if I cannot get a new one from Delta I will have one machined.
My question is: then what? I know nothing about how these things work. It appears as if the steel plate on the front is made to slide in a groove to keep it square to the miter slot, correct? And there is a large plated clamp on a sliding dovetail to, I assume, clamp the work to the jig. So far so good, I think.
But what about all those holes? There is a rather large hole exiting vertically from the casting and another five holes on the vertical machined face. What is that all about? Any help on this at all would be greatly appreciated.
Replies
Photos? Pictures? Sketches?
Picture.
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It would indeed be a tragedy if the history of the human race proved to be nothing more than the story of an ape playing with a box of matches on a petrol dump. ~David Ormsby Gore
Edited 8/21/2007 9:32 pm by dgreen
Couple more pics.
I think OWWM is due credit for the pics. Been so long I don't remember for sure where I aquired them. All apologies to the original photographer.
My Delta jig is newer and I know there are at least a couple of posters on this forum that have his model, so I leave it to those more qualified to explain the holes etc.
I thought I had a manual squirrelled away for that jig, but I can't seem to lay my hands on it.------------------------------------
It would indeed be a tragedy if the history of the human race proved to be nothing more than the story of an ape playing with a box of matches on a petrol dump. ~David Ormsby Gore
I'm looking at one I made from wood. I'm guessing,but those holes
must be for attaching small (45 degree) stops or fences to accommodate cutting dadoes for splines for mitered picture frame corners?
You can easily fashion your own from wood and secure them with screws through those holes.
That 'sole plate' probably ,is a home made adaptation to fit a non-standard(3/8x3/4") miter gauge table slot???
Easy job for a machinist
Steinmetz.
The photos are of the beast in question.
I do suspect the holes in the face are to facilitate angled tenons, but how to use them is a mystery to me. As is the larger hole in the top.
I can't imagine what the deal is with the sole plate. It fits a standard miter slot, but there are no grooves to square the jig, and the spacing is odd, apparently made for a table saw with the slots somewhat farther away from the blade than on my Powermatic.
I have to go to the machine shop tomorrow on another job anyway, so I will see if I can get one made.
I dropped the jig off at the machinists today. He is going to take 3/8th steel plate, mill it flat on both faces, cut the necessary grooves, drill and tap the holes for the screws. I really did not want to ask "how much".
His suggestion was to forget the jig and get a vertical mill.
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I dunno though, what with pouring a new base to set it on, getting the power supply, clearing out a space to set it, getting a divorce..., it may not be worth the trouble.
He was showing me some of the stuff they machined from wood to make moulds for castings. I'm having trouble getting to within 1/16th" and he is working in the range of .00015". Need some extra income from your woodworking? Learn to do this. He had a piece maybe 5" X 5" by 4" that billed out at $6,800. Used once.
The other interesting piece of woodwork was his boxes for sand casting. Made of 5/4 cherry with box joints on the corners. They press the joints together with a 10 ton press.
I think he either mislead you or you didn't fully understand what he was saying. He's not working to .00015" in wood I can promise you that! That's a precision grind tolerance on hardened steel, and very rare to see in a job shop.
Typical milling tolerances in steel are +/- .005" which is easily achievable.
Typical pattern making tolerances are +/- .015".
"I never met a man who didn't owe somebody something."
Look, just to clear up some confusion: that Bridgeport milling machine is worth at least 5 divorces (;)Philip Marcou
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