Help!! my scrollsaw is cutting narrow on the bottom

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Forum topic by TJ65 posted 03-27-2010 09:22 AM 1343 views 0 times favorited 8 replies Add to Favorites Watch
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1376 posts in 3016 days

03-27-2010 09:22 AM

Topic tags/keywords: scrollworking question

leafOk. I worked on this project for a few hours here and there. In between using the saw for numerous other cuts.
It is a A4 leaf shape stacked with ply and MDF to about 20mm. Now nearing completion the saw is cutting excessivly thin on the bottom while the top is perfect.
As you can see this project involves many fine cuts so each one needs to be perfect.
I have made sure the blade is set straight with a set square, I have changed to a new blade, My saw is a new Excalibur and has grub screws to help locate the blade which i have also moved and adjusted. Now each of these times it helped a little until the last time when I was watching rather intently and noticed the cuts narrowing once again.
WHAT’S HAPPENING!!!!!!!!!!!! It really is giving me the S#%^%$@!

-- Theresa,

8 replies so far

View Eagle1's profile


2066 posts in 3031 days

#1 posted 03-27-2010 12:39 PM

do the blades have a taper from top to bottom? That what it sounds to me. I had a friend of mine that it happened to.

-- Tim, Missouri ....Inside every older person is a younger person wondering what the heck happened

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1376 posts in 3016 days

#2 posted 03-28-2010 12:31 AM

no sorry they are not tapered at all
anyone else have ideas????

-- Theresa,

View stefang's profile


15881 posts in 3300 days

#3 posted 03-28-2010 12:50 AM

I have had the same problem with my Excalibur. The grub screw comes loose with vibration and has to be reset once in a while. It can also be that the top screw is centered while the bottom is not or visa versa. You might also check your Excalibur handbook to see if there are any tips there.

-- Mike, an American living in Norway.

View MrsN's profile


985 posts in 3492 days

#4 posted 03-28-2010 01:49 AM

I have had that problem if my blade is not fully tensioned or is losing tension as I cut.

View Michael Murphy's profile

Michael Murphy

453 posts in 2971 days

#5 posted 03-28-2010 03:53 AM

I don’t use a scroll saw. What do you mean by “Narrowing” or “cutting excessively thin at the bottom”. The cut is not completely perpendicular to the table?

A guess would be with that thickness and all the glue in the mdf and plywood the saw tooth gullets are filling up at the lower part of the blade.

-- Michael Murphy, Woodland, CA.

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1376 posts in 3016 days

#6 posted 03-28-2010 04:26 AM

The whole problem is that is was working well for the first half to 3/4 and then it started playing silly buggers!(now that’s real Aussie slang for you!) translated to” Playing up “

-- Theresa,

View Belg1960's profile


1062 posts in 3031 days

#7 posted 03-28-2010 11:42 PM

Theresa have you made sure the tabletop is secure? I had this happen once on my bandsaw and discovered that the set screw had worked its way out, and by just leaning on the top it would move ever so slightly. Pat

-- ***Pat*** Rookie woodworker looking for an education!!!

View Alex Lane's profile

Alex Lane

500 posts in 3856 days

#8 posted 03-29-2010 05:56 PM

I’ve noticed that when I use my Delta 16” SS, the blade slightly oscillates from left to right as it moves. I don’t know why it does this, but it doesn’t affect my cuts too severely. The worst my scroll saw seems to cut narrower on the bottom is around 1/32”.

Have you tried spiral blades? They cut in any direction, and might help you to get an consistent-width kerf through the wood you cut…

Also try a slightly higher tension. As I’ve found with bandsaws, adequate tension is critical to a straight cut, so I’d guess that the same principle is true of scrollsaws.

-- Lane Custom Guitars and Basses

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