Originally Posted by
Mark Bolton
Can I ask why you feel you need a worm? I have worms and direct/conventional's and I honestly cant imagine why someone would "need" a worm drive. For years the notion has been that they have more power/torque however I have never once found this to be the case. What I have found to be the case is that #1 they are great for where they became popular which is California framers, who liked them for the long reach because when stick framing became the convention you cut studs picked up off the ground on the toe of your boot. The extended distance between the handle and the blade center means you dont have to bend/stoop as much. #2 When cutting at full depth your hand is way behind the blade which gives better control (timbers). You have more leverage and an extended fulcrum which tends to make cutting easier. This is no longer the case however as so many gang cut sticks in a pile, work off chop saws, horses, and so on, and few work with timbers any longer.
That said, where they suck is at shallow depths (cutting sheet goods) when the blade is raised and now your hand control is at a high angle and distance to the work (dangerous as heck), and the weight. The weight is surely nice in some applications but I have simply never found a worm to be an all around saw. They are a specific purpose tool, and one that is becoming less and less needed with each year that passes.
I cant express enough the danger of using a worm for things its bad for (cutting window openings on a wall for instance). Shallow cut, in positions you have reduced control, and so on. A blade that far away from your hand is completely out of control when you get in a bind. For me personally, there is not a pinch/bad situation in the world where I cant overpower any 7 1/4" saw (but Im a pretty big guy and work with them almost daily) but a worm will twist your wrist off in a flash even if you see it coming and where that blade goes is the question. You cant stop them. Not because of power, but because the torque is so far from the handle.
Id go for a 77mag all day long if I had to have one.
THE WORM-DRIVE MYSTIQUE
Saws with the motor parallel to the blade transfer power through a 90-degree turn. Most of these use a worm drive -- a gear design that reduces blade speed and increases torque. (Makita uses hypoid gears.) Worm drives are known for unstoppable power, but the tradeoff is a heavier, unbalanced tool with a higher price. If you know a carpenter who uses a worm drive, don't argue with him -- he's probably stronger than you are.
From:
http://www.popularmechanics.com/home/reviews/4205480
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