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Feel the burn baby... scroll saw ooopsss

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Forum topic by David Craig posted 650 days ago 847 views 0 times favorited 3 replies Add to Favorites Watch
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David Craig

2135 posts in 1734 days


650 days ago

Topic tags/keywords: scroll saw scroll saw blades flying dutchman hook angle

Ok, part of this is an admission to stupidity or at least an admonishment to myself to use the resources available to me to do some research before using something I am unfamiliar with.

I have done a small amount of scroll sawing, but mostly with cheap blades and not usually the ones recommended by authors of projects. I had a collection of blades from the local HD and just used those to get familiar with the machine. I ordered some reverse tooth blades from an online company (blades are Flying Dutchman). I was told, once, by a friend, quite awhile ago, that he didn’t worry about how he mounted the reverse tooth blades because they are the same in either direction.

Ha. Ha. Ha.

I noticed some burning when trying to saw through some fairly thick maple. I attributed much of this to the size and thickness of the wood and played with the feed, speed, and tension. The project didn’t go very well (7r was the blade size, btw). My eye sight is not what it used to be and I had a hard time seeing hook angle by the naked eye so I decided to research a little further under the usb microscope.

Here is the hook angle change -

Here is where the hook angle changes -

Obviously not the center :)

So the reason for the burn was because only about an inch of the blade is actually going down into the wood while the rest of the blade was going in reverse. There was just enough cutting force to indicate the blade was cutting, but enough going in the wrong direction to impede smooth cutting.

Two words of advice. Pay attention to your hook angle and visit scrollgirl's site as she has a nice little break down of the different blade types.

David

-- There is little that is simple when it comes to making a simple box.


3 replies so far

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patron

13001 posts in 1966 days


#1 posted 650 days ago

live and learn
as they say

i think the reverse teeth are offset
so the up ones just cut some of the bottom into the wood
and not shred it there
the top are more for different thicknesses
and do most of the actual cutting

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View David Craig's profile

David Craig

2135 posts in 1734 days


#2 posted 650 days ago

Oh the reason for it is completely logical…just sometimes my forward logic isn’t as good as my backwards logic :) But then again, my backward logic might be the problem in the first place…

-- There is little that is simple when it comes to making a simple box.

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Sandra

4248 posts in 700 days


#3 posted 650 days ago

I love hearing these stories. As long as it doesn’t involve an injury, it’s a good chuckle and a good lesson. The first time I used my planer, it tripped the circuit breaker with the board halfway through. Once I realized the shop vac was full, it still took me quite a while to figure out that I just had to turn the crank to raise the blades…. And I had read the instructions.

-- No, I don't want to buy the pink hammer.

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