I feel foolish asking this, but does anyone have experience with setting up the knives in a corrugated molder head for the shaper? The rabbiting blades are shorter than the head. Do I install the blades at the top of the head and fill in the remaining space with what appear to be filler blanks? Should the blades be flush with the top of the head? Do the knives have to be mounted as deep as possible or are they designed to be moved out to provide more cutting depth? Thank you for your consideration. I am sorry to have to ask such elementary questions.
Rick
Replies
rick I replied to your other post
I dont know which other post Dusty replied to so I may echo some of his comments. Dont be concerned about the question. This is a dangerous machine that must be respected. I asked my rep the same. I will assume we are talking 5/16" insert blades. If it is less, your case will be diff. I was told over 25mm shorter you should use filler pieces. As to the location in the head, I put mine in the best spot for the clamping and then removed the extra set screws at the top. At first I left the set screws in, but I noticed the gib would deform ever so slightly when I tightened the screws. The projection is up to you so long as you are within spec for the blade thickness. The max projection for 5/16" blades is 25 - 30mm. The farther you push them out, the faster the tip speed, but I keep them inbound as far as possible as I prefer more corrguations being effective.
Brad
Dear BradThank you for reminding me that the tip speed will increase as the blades are extended. Even if my thinking sometimes takes a holiday, the laws of physics do remain constant. Intuitively, I would like to keep the blades as far in the head as possible. Thank you for taking the time to respond.Rick
Brad ,
Just curious about your comment of the further out the knives are out the faster the tip speed is . I don't understand why you are concerned with what you called the tip speed , the rpm will not change regardless of cutter diameter .
Most shapers spin 8 - 10,000 rpms , the increased surface feet has little to do with anything to my knowledge , can you explain so I understand what you mean ?
thanks dusty
Check out the Router Bits in a Shaper explanation in the link below for some good info on tip speed.
http://benchmark.20m.com/articles/ShaperVersusRouter/shaper_versus_router.html
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Not really a concern at all so long as he is within spec. Bigger diameter, greater velocity at the outside. Thats why the max rpm for big diameter cutters is smaller. This is a simplified explanation of sorts, so hopefully no techno guys will beat up on me.
A 12" diameter (tenon head) max rpm is around 3000rpm, and lots of 4" diameter ones ones are rated for 10,00rpm. If you keep near the max ratings for the cutter, you will get the best cuts per inch.
Brad
Edited 9/20/2008 2:11 pm ET by brad805
Can you show a picture of this cutter block then we will know what we are talking about?
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