I have the GI, works fine but I don't see myself using it very often. A domino or a slot mortising machine (which I wish I had) would be a better choice.
I have the small domino and would likely get its bigger bro instead.
Used a Gereral drill press for years before getting a mortiser. It worked well only thing I put more length on the handles for more leverage for woods like birdseye maple and think its hard on the drill press so finally got a dedicated machine. If you werent doing alot I dont think its a bad idea but not really sure.
I've had the 75-075 for a decade or so now and wouldn't want to be without it. The sliding table makes it well worth the additional cost, IMO. Once you set the stops for a given project you can crank out lots of parts without fussy marking and measuring. For me anyway, every measurement is a golden opportunity to screw up. The chisels that came with it needed a *lot* of work to become even passable.
I understand that..totally..$$$$ is always an issue. If I had it to do over, I would use a forstner & a chisel, while I saved my $$$ for a domino. I adore the little bugger that much. :-)
Be the kind of woman that when your feet hit the ground each morning, the devil says, "oh crap she's up!"
Tolerance is giving every other human being every right that you claim for yourself.
"What is man without the beasts? If all the beasts are gone, men would die from great loneliness of spirit. For whatever happens to the beasts will happen to man. All things are connected. " Chief Seattle Duwamish Tribe
About 6" X 1-3/8" for a bed frame. That was done with a 5/8" chisel though, taking multiple cuts. I don't use a chisel bigger than 5/8", the 3/4" one takes too much pressure, it feels like I'm going to bend the arm when I've tried to use it in hard wood. Might well be fine for timber framing in softer woods.
Fine Woodworking recently did a review of bench top mortisers. You might check their website.
Steve Jenkins, McKinney, TX. 469 742-9694
Always use the word "impossible" with extreme caution
Matthias Wandell's woodgears.ca website is a treasure trove for homemade tools. Here's the link to his X-Y slot mortiser: http://woodgears.ca/slot_mortiser/plans/index.html
I have built his tilting router lift, and will build his box joint jig once I finish up a few other projects first.
Highly recommend.
Brad