Instructables
Picture of Improve an Inexpensive Scroll Saw - Add Knobs!
This instructable will show you how to improve an inexpensive scroll saw. This type of scroll saw typically accepts blades with pins, but comes with adapters for pinless blades, which are more commonly used. Specifically, I obtained this scroll saw from harbor freight tools, which I think is a great place for hobby tools.

Although you can purchase knobs, they are typically very expensive. For me, a #10-32 screw costs $0.09 versus a knob which costs $2.80 which I found at a local Ace Hardware store. I will show you how I made my own knobs for less.
 
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Step 1: Original Adapter

Picture of Original Adapter
00B - Screw.jpg
For reference, this is the original adapter. To use pinless blades, the blade must be inserted between two adapters and tightened with a hex-wrench. When there is no tension on the blade, it does not stay on the scroll saw body and falls off, since tension holds the adapter to the scroll saw.

Step 2: Drill and Mark

Picture of Drill and Mark
01B - View.jpg
01C - Trace.jpg
Find and drill a piece of wood. The holes should be far enough apart, to prevent the knobs that will be created from interfering with one another. A drill press should be used to make a straight hole. A compass should be used to draw circles around the drilled holes for the knobs.

Step 3: Wax and Level

Picture of Wax and Level
02B - Level.jpg
In this step, wax the wood. I used a candle and applied it quickly to create friction. Level it using a razor blade; this will fill in and even the surface. Most importantly, it will prevent the epoxy used to make the knobs from sticking.

Step 4: Measure, Clean, and Ready

Picture of Measure, Clean, and Ready
03B - Extend.jpg
03C - Unscrew.jpg
03D - Clean.jpg
03E - Ready.jpg
The depth of the screws should be measured so that they extend out of the wood, and so that there is a small gap between the head and the wood. This will allow the epoxy to completely surround the head. Dept is indicated by how far the screw extends out of the wood. Lastly, the screws should be cleaned with acetone and pulled out somewhat to allow for the epoxy to be put underneath the head.
Tex Arcana7 months ago
why not just use wing nuts, instead of going thru the trouble to make the knobs? also, how are they holding up?
vreinkymov (author)  Tex Arcana7 months ago

It was easy to find wing nuts, but getting wing screws was difficult.

westcyri11 months ago
I replaced the center insert with a solid piece of wood. I was tired of the flimsy black plastic. Simply measured the diameter and what thickness I could fit. After making the piece fit flush with the table, I drilled a hole large enough to pass the blades through.
Well, .... I use mine without the side port.
vreinkymov (author)  enVide neFelibata1 year ago
I did that too. I originally planned to use two knobs per adapter, but it looked silly, so I used the other two for the side port.
pfred21 year ago
I don't scroll like I used to. I have a couple saws now but my Delta is my best one. Recently at a yard sale I saw a Hawk for sale but being as I don't scroll so much anymore I passed on buying it. People really into scrolling swear by Hawk saws. I don't know, I guess my Delta is OK. The other thing folks who are really into scroll saws swear by is Flying Dutchman scroll saw blades. A Hawk saw might be out of your reach, but you can probably afford to buy some Flying Dutchman blades and give them a shot in your saw. I'm not saying it'll turn your saw into a Hawk, but it might be an improvement.

Other than running decent blades the other thing you can do is bolt that saw down to something really heavy. By something really heavy I mean like a stand made out of thick steel. Attached to that kind of mass it might make the saw somewhat smoother. Mass dampens vibration. By really heavy I mean massive, a couple hundred pounds at least. Find an old straight engine block and bolt the saw to that, with the head removed of course. Naturally this makes the tool less portable, but sometimes you have to sacrifice some features in order to gain others.