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03-15-2014 10:06 PM
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Hi Guys, I’m having problem using a router table to make mortises in cherry. I have a 1/4” up-spiral bit (towards the router) and what I’m doing is feeding my piece each way towards the bit in order to get a perfectly centered mortise.
This works well when I’m cutting a mortise at the end of the piece but when I do a plunge mortise, I cannot get a smooth wall – mostly on the side of the bit farthest from the fence (this seems backwards to me).
I clamped on a sturdy guide rail to hold the piece against the fence, I use a lot of hand pressure, and I’m only routine 1/4” depth changes at a time, and still it chatters and turned out badly.
Since the end mortises work OK I’m really perplexed why the plunge ones don’t.
Any ideas would be appreciated.
Don
-- --- Measure twice, mis-cut, start over, repeat ---
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12 replies so far
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#1 posted 03-15-2014 10:21 PM
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small spiral bits always chatter when plunging I purchased a mortiser because of this type of results try using a non spiral bit if you have no other choice they have always worked better for me
-- Please check out my new stores http://woodratnest.com and http://woodshopstore.com
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#2 posted 03-15-2014 11:45 PM
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I know other’s like and praise the up cut spiral cutters but I haven’t had great success with them. It may very well be a fault of mine. I know how a straight bit will respond, but I’m never sure with the spiral bit. Glad to hear someone else has had a straight bit perform better.
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#3 posted 03-16-2014 02:48 AM
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Thanks. I’ll give it a shot tomorrow. My spiral bit was long enough for depth of mortise I want. If I still have a problem I will try firmly mounting the wood and make a jig.
-- --- Measure twice, mis-cut, start over, repeat ---
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#4 posted 03-16-2014 02:59 AM
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?
-- --- Measure twice, mis-cut, start over, repeat ---
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#5 posted 03-16-2014 07:19 AM
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I have to tell you the best up cut bits I have tested for a review were the White side
-- Please check out my new stores http://woodratnest.com and http://woodshopstore.com
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#6 posted 03-16-2014 07:30 AM
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SuburbanDon – I agree with ???? :)
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#7 posted 03-16-2014 07:32 AM
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I too have notice the up cut spiral bits have a significant amount of chatter, must be the nature of the beast. Also the reason I got a dedicated mortiser. I am, however, considering making a horizontal mortiser somewhere down the road….
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#8 posted 03-16-2014 08:32 AM
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I’m wondering if the spiral bits work best with the more powerful routers or if the speed setting has to be just right. Just a thought.
-- Mike, an American living in Norway.
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#9 posted 03-16-2014 08:41 AM
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really i think they flex too much when they are this small I prefer the straight cutter and I done have this problem. When I am on the Woodrat 900 or 600 I have a plunge bar and a control and the mortise rail all make cutting these small mortises fast even faster than my hallow chisel mortiser
-- Please check out my new stores http://woodratnest.com and http://woodshopstore.com
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#10 posted 03-16-2014 11:23 PM
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Sorry that ”?” Was not intentional. I could not delete the post.
Thanks for your replies. Today I made a jig (tray with a slot) and had similar results. This was done with a straight dado bit. I will try other things.
-- --- Measure twice, mis-cut, start over, repeat ---
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#11 posted 03-17-2014 03:00 AM
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I think I solved this problem but have not verified it yet. The speed may be too. I just realized it is set to 5.
-- --- Measure twice, mis-cut, start over, repeat ---
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#12 posted 03-18-2014 12:43 AM
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Solved. The speed was not as important as getting a 1/2 shank bit and a slow feed rate.
-- --- Measure twice, mis-cut, start over, repeat ---
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