This is the email I received back.
Hi Dave,
Thanks both for your business and for sharing your concerns. I am happy to explain.
The blade must be (and is unless the machine is damaged) perfectly perpendicular throughout its entire vertical stroke when viewed from the FRONT. This a condition which depends entirely on the machine - operator input or actions do not affect it. Your concern is the view from the SIDE - an entirely different matter.
Two items are in play here: the first is the static position of the blade, which is determined by where you place it in the blade clamps. Per factory guidelines, the blade should be centered in the clamps. However, you can either deliberately or inadvertently position the blade either a bit forward or rearward in either or both clamps, and this necessarily affects the static blade position accordingly. Use of the HQK (Quickclamp) also affects this, since the blade is not centered but pushed all the way back in this optional alternate clamp, and its proximity to dead center therefore becomes a function of blade width. The static position is NOT necessarily required to be vertical at all points throughout the stroke (see next paragraph), and in fact in most scroll saws it is not, including on your machine. However, HEGNER saw geometry produces blade position closer to constantly plumb position than any other brand of constant-tension saw - we are talking about fractions of a millimeter.
The second component of the blade's position is its motion, i.e., the movement the blade makes as it cycles up and down. This is another non-adjustable function (other than by stroke length adjustment, which can reduce the amplitude of any lateral excursion), and in fact the motion geometry varies slightly among different HEGNER models based on other design requirements.
The blade motion is the consequence of the arm pivot span compared to the span of the blade assembly. Each arm moves through a small arc as it pivots, and how these arcs match up dictates blade position at any point in the stroke. In the 18 and 22 models, the bottom end of the blade moves slightly backwards on the upstroke, and is then draw forward into a vertical position at the bottom of the stroke, thereby achieving the vertical cuts for which HEGNER saws are known. This bladee action also tends to reduce blade friction on the upstroke (less lifting - more comfortable sawing), as well as finishing the sawn edges so that they require a minimum of, if any, sanding.
As to changing the position of the top arm stop, I can understand your desire to lift the arm further out of the way - a noble goal indeed. However, this is precluded since lowering the stop would sacrifice the (in our view far more important) safety feature of instant upper arm stoppage on blade breakage. With the stop lower, the spring would not have enough pull to secure the arm against the stop. Why not a stronger spring? The upper arm then becomes too stiff to comfortably pull down to reinstall the blade in the upper arm. Plus the arm travel would be too great for those with average hand size to comfortably reach for efficient blade reattachment.
Trust me - I know anything can be somehow improved, but HEGNER saws are overengineered with a focus on balanced performance, with emphasis on the characteristics that are of greatest everyday and long-term value to the broadest palette of users, to a level that simply puts all other saws to shame. This is why after four decades on the world marketplace, HEGNER is the ONLY scroll saw specialty brand still made by the same manufacturer, and sold by the same company in North America, as when it was first introduced.
I am confident you will continue to enjoy your HEGNER ever more as you use it more, and encourage to contact us anytime you have more questions or concerns.
Sincerely,.
Hanns Derke - Customer Service
Advanced Machinery/SharpToolsUSA
POB 430
New Castle, DE 19720
USA (302) 322-2226