Woodworker's Journal 1992-16-6, страница 72

jmi.iIM link I vcaliher had very liule li.tw.iiil tuning action on the down-n itr although the aggressiveness of . ol w.is about till, same as the llegner.

What To Ijook Fnr

l th/ation—Because scroll saws cut with a reciprocaling (up-and-down) motion. ralhcr than a continuous cutting .it iion like a hand saw. you can expect a certain amount of vibration—ii'sjust the nature of the beast. However, better saw s are engineered to keep vibration to a minimum, which results in greater cut-ling accuracy, prolonged blade lite, reduced operator fatigue, and less wear on hearings and other moving parts.

A number of factors contribute to saw vibration: sloppy or out-of-round bearings or bushings, misalignment of upper and lower arms, or a poorly balanced drive system, to name a few. Some saws.

I'lwlo 3: Delia 40-601

such as ihe Delta, overcome vibrahon problems largely bv sheer mass alone: the siurdv casi-iron arms and base make lhts saw as sturdy as a rock. Lighter-weight saws, such as ihe Hegncr Multi-max 18V, Excablvr FX II. and bolh the RBI saws. rclv on precision machining to keep vibration lo a minimum. (This is not lo say thai the Delia is poorly machined, by am means). The llegner and Excaliber. by the wav. showed ihe leasi amount ol vibration in my lesis: ihev were a joy to use. In comparison, llie Delta and RBI s;iw> had some vibration, hul not enough lo affect cutting performance or to he particularly annoying, the Shopsmith vibrated ihe most -a bii too much, in my opinion. It did perform satisfactorily in my culling lesis. bul llie vibration was irritating.

The way ihe saw is mourned also has a lot io do with vibration. Most of (lie

Photo 5: H eg tier \lu hi max 18 I

saws icsied have sturdy stands, either as standard or optional equipment. W hile lesiing one of the saws, ii w as making an irritating rattling noise. Upon closer inspection. I noticed that 1 hadn'i fully tightened one of ihe bolls on ihe stand. As an aside, a dab of silicone seal placed in the hole around each boll during siand assembly will further reduce ihe likelihood of stand vibration. Also, make sure you install the leveling feet (hat come wiih ihe siand and adjust them properly. You can mount any of these saws on a bench, bul on most benches, you'll find that the saw w ill vibrate more than when mounted on a siand. We'll have more on stands later.

A final word on vibration: even with ihe besi saws, you may receive a unit that has excessive \ i brat ion: the cause is usually due to nuis, bolts or screws thai work their wav loose during shipping.

Phot,, 7: KHI Hawk 220VS

Photo 4: I i cattbrr EX II

Photo 6: Rlit Hawk 2I6YS

Photo 8: Shopsmith 555272.

IV Woodworker's Journal