Scrollsaw blade direction

[planeur]

Hello blade experts , I have a question after a test I did with a blade.

I was cutting a marquetry sheet with my scollsaw with the blade with the teeth facing down, as normal!

But if you take a look at the photos, you will see that the cutting is better under the sheet when cutting

 

and worse the other side ( the top side )

 

So my question is : do you cut sometime with the blade the teehs facing up?

I had to cut a sheet on my projet which was already glued to the projet so I did cut it with that method and it worked as the testings.

Will shoe you soon my projet...

planeur

[Wichman]

Since marquetry panels are usually very thin, I need to ask a question: are you using a reserves tooth blade? If you are, there's your answer. 

If you are cutting a 1/8" thick panel you should be trying for a blade with 42 tpi for a 1/16" panel then upwards of 84 tpi, and that's into jewelers blade territory. (this is bases on the concept of having 3 teeth engaged in the material at any given time). 

[planeur]

Thanks Wichman, but what is a reserve blade ? If I understand it should have more than one theeh in the thickness of the piece we cut ! Right ? That make sense.

And I do not use a tooth blade with that much teeths.

I am using Pegas blades with 12 or 14  or 22 tpi ( # 5 #7 and #9 )

Nerver see saws  with so much teeths.

planeur

[Wichman]

A reverse tooth blade has 7 to 10 teeth on the bottom of the blade that saw in the opposite direction, the effeect in thicker wood is that the fuzzies or rough edges are reduced.

Typically a reverse tooth blade will have an R in the name or abbreviation,

You probably need to look at using a much smaller blade, #1 or #2/0.

[planeur]

Thanks for your infos!  Did not know that kind of blade!

Have a good day

 

planeur

[planeur]

What I had to cut is from the back of my piece , because the only place to see the pattern to cut.

Back side

top side before cutting

 

À suivre...

[Wichman]

If you just have to cut from the back, then you could use tape ( painters tape, clear packing tape, or shelf liner ) to help minimize the splintering.

[planeur]

Yes ...... I had forgot that trick! And it is a good one for that kind of thickness.

Thanks !

My post is coming.....

Planeur