cutting different on patterns

[edward]

I been trying to make a car and when I cut the patterns they seem to come out different even three that are the same, and  I follow the lines the wood is 1/2" pine. Thanks for any information

[Wichman]

Are these the downsized patterns?

What did you do to downsize them? How thick are the lines?

Are you cutting on the line, the outside of the line, the inside of the line? I print my lines in red, at .005 width. I can micro adjust the size of slots by changing where I cut relative to the line ( I start by trying to erase the line, centering the blade on the line).

[preprius]

stack cut on .5 inches thk wood 3 high is doable but slower.

 

[TAIrving]

13 hours ago, edward said:

I been trying to make a car and when I cut the patterns they seem to come out different even three that are the same, and  I follow the lines the wood is 1/2" pine. Thanks for any information

There are several things you might be doing to make them come out different.  

Check to make sure the blade is perpendicular to the table.  

Ensure that the blade tension is set and check it frequently.

Do not push, go slow and let the blade do the cutting.  Pushing the work into the blade will cause the blade to deflect and the cut will vary from the pattern.  If stack cutting, the cut on the lower board(s) will be different from the cut on the upper board.  This is accentuated if the tension is not set.

Pine is difficult to cut as the wood hardness is different in and between the growth rings.  

Good luck with the cuttings.  

 

[rash_powder]

No matter how hard you try, even following the line precisely, you will never get two seperate pieces exactly the same when cut individually.  There will always be tiny errors/defects/whatever you want to call it because you are human.  Cutting multiple parts at the same time will greatly increase success rates.  

Also, with pine, the grain can guide the blade in ways you do not want.  I primarily use popler, but any wood can 'steer' the blade away from time to time.  

[CharleyL]

Are you stack cutting? if your blade isn't perfectly vertical and tight, there will be differences between them. Not only insure that the blade is perfectly 90 deg to the table, but remains so through the entire stroke. When single cutting, it's nearly impossible to cut several pieces one at a time and get the same result every time.

Charley