As for machine vibration other village members have better knowledge. I would not bend any arms until others tell you otherwise.
Saw speed :
the previous owner might have reasons to keep it slow. Like vibration issues. But he might just prefer slower speeds like I do.
blades....
metal... flying dutchman (US brand), (Sawbird , Canadian brand) Niqua mfg. aluminum cutters #7 I had good result cutting aluminum.
Pegas blades I prefer. MGT good for hard wood such as purple heart, hard maple, and black walnut.
But flying dutchman "Polar" series is good also.
Skip blades sometimes cut better than polar. Also note wood grain direction comes into play.
Olson has a series Precision ground that I used before switching to Pegas.
I recently ordered blades from Garnet Hall , he is in Canada. Same manufacturer as Flying Dutchman.
Also ordered Pegas from Artcrafters. Denny posts here often and is very helpful. Lots of experience.
Blades should cut on downstroke. It pushes against table. Sometimes a blade gets put in upsidedown and it takes a lot of strength to hold the wood.
All mfg have something called reverse blade. this means 5 or 6 teeth on the bottom point up. This to helps prevent tear out on bottom of wood. Pegas MGT (modified geometry) has these reverse. You need to look careful on how you install reverse blades.
Blade Recommendation:
Get assortment. everyone told me to try equivalent to the following .... skip, double skip, super skip, MGT , don't forget spiral blades. Once you decide on your goto blade you will still have some assortment for when something is not working.
Fretwork: some of the best fretwork artist use spiral blades.
Blade tension: Get it tight. As tight as you can without the blade slipping out. If you know notes you can do the the high "C" as a guide.
The thinner the blade the proper tension is important. The tiny blades will twist easy. higher tension reduces the twist. If the blades are breaking in the middle you might have too much tension. And you could be pushing wood too hard. There is sweet spot on feedrate. This sweet spot is barely faster than what the blades feeds itself. In otherwords slow and effortless. Of course most of us push the wood faster.
When precision is needed. Bowls, inlay , intarsia: keep the blade from being pushed left and right. This side pressure changes the cut angle and makes pieces not fit well. Stay in the sweet spot of feed rate.
In some cases your goto blade just seems weird, wont cut to the right but only left. This I have seen when I have a different thickness of cutting as in I have not tried this thickness before. I think the blades find a resonance and just won't co-operate. so change blades with 1 step thicker.
I bought a lot of lower quality 2nd tier blades. They were cutting only in 1 direction. Don't cheap out on blades. It is frustrating.
Wood recommendations:
The tool should be able to cut most all wood. When cutting turning blanks, 1.5"x1.5" keep the wood soft to med. I tried apple branches at 1.5". I don't recomment it. Purple heart should not go above 0.5". I just cut 0.5" purple heart and aspen stacked. It takes time. I was inlaying so precision angles are needed.
Maple and black walnut is good to cut at 3/4". MGT #1 for precision. #5 is good for most other projects.
On really hard woods keep the wood thin Less than 3/8" It was highly recommended to me last week. I had 1/2" already so I wanted to use it. It is like watching mooshine freeze. alchohol does not freeze.
My starting point was late in 2020. I don't want to manually do what a laser cutter can do. So I like stuff thicker than 3/8". Bowls require angle cuts lasers are not doing that yet. Intarsia is beautiful. I also prefer to make funtional items but not always.
Check out members galleries.
@Dave Monk Monk's is inspiring.
@MarieC very creative,
@FrankEV brought color into portraits.
@OCtoolguy functional pieces. He is a wizard at fixing scrollsaws. He also helped me get a great used hawk. The best move to keep me interested. Fighting cheap entry tool on cutting apple branches I almost stopped.
@Tbow388 bowl expert. Nice country series also.
Lots of others. wood carving, coin cutting, Pattern makers are a great help also.
And my project gallery, the only wearable scrollsawn cowboy hat so far. Also a hollow football.
This scrollsaw village helped me be less frustrated at the tools and has helped me on techniques. They have helped me every step of the way.
Me. Mark Eason.