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Thread: snip driving me crazy
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20th October 2009, 10:02 AM #1Senior Member
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snip driving me crazy
Hi all,
I need your help as this thing is driving me crazy.
I am currently using the incra wonderfence system to trim the edges of some 3/4" boards in order to make door panels.
for those not familiar with incra wonder fence, you can set it up to offset the outfeed or infeed fences against each other to trim the edges. Similar to a shim inserted behind a fence.
anyway I offset the infeed fence negatively (the outfeed fence is therefore aligned with the cutting edge of the router bit) so that I trim only a little bit.
It is offset to trim less than 0.5mm.
My problem is towards the end of the board.
I feed in the board and when it is close to the end, the board simply move towards the router and creating this snip.
My understanding is that when I feed the board in, once passed the router bit, the board should be against the outfeed but this is not the case.
It seems that there is a gap of probably 0.5mm and this gap closes in as you move towards the end of the outfeed fence.
The board comes into contact with the outfeed once it passes half way the outfeed fence.
This is driving me crazy. I used a grr-ripper to hold it firmly down so that it does not move and other methods
To some extents I have succeeded but I have to be very careful. this is not the way it should be.
could it be that the outfeed is not aligned with the outer cutting edge of the router bit? although I have checked. But like measuring twice, I could check again
Thanks
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20th October 2009 10:02 AM # ADSGoogle Adsense Advertisement
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20th October 2009, 10:12 AM #2
Sounds like the outfeed isn't properly aligned with the router bit. The outfeed must be setup in line with the cutting edge of the bit. Use a straight edge on the outfeed, to set it to the cutting edge.
Chris
========================================
Life isn't always fair
....................but it's better than the alternative.
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20th October 2009, 07:05 PM #3
To joint the edge of the board using a jointer or a router table, the tables or fence segments need to be in the same plane but offset by the depth of cut you wish to take. As previously discussed, the outfeed support (table or fence segment) also needs to be aligned to the cutter, with the infeed set back.
There are three things that I can think of that might limit the ability to joint the edge.
- Fence segments not aligned in the same plane, or able to move during the job due to inadequate support.
- Router moving within the table under load due to low rigidity or table flex.
- Board edge being jointed has a significant curve and you are allowing the cutter to follow the curve, taking an even cut along the edge but not straightening it. Check the edge with a long steel rule or other very reliable straight edge and mark the high spots, then make a series of short jointing passes over the high spots to gradually reduce them to the lowest point, as you would if you were jointing with a hand plane.
One other point to consider is that the wonder fence is from memory 28 inches long, giving 14 inch infeed and outfeed subfences. This is fairly short if the board is a decent length. Haven't seen many jointers that short.
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