Question Harry Rabbets w/Morso Chopper

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Hedenberg

Hedenberg

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Jun 8, 2008
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I'm new to the chopper world but I really love it. On several types of moulding, the cut at the rabbet looks almost torn. I've tried slower cuts on the last cut and sometimes that solves it - sometimes not. The 'hairs' can be rubbed off with my thumb so it's not a big deal.

My question is: Is it a technique thing (I've tried smaller slices and bigger bites with no common denominator) or a blade sharpness issue? The blades are new and only have about 1K cuts on them.

Kindly,

Susan
 
Sometimes this is caused by too much space between the support and the rabbet. Try tightening this up on the moldings that are giving you trouble. It may cause the molding to bind a bit, but frequently eliminates the splitting. Sometimes a small amount of lubricant will get you a cleaner cut. If you are cutting moldings with compo, the blades will need to be sharpened much more frequently and a dull blade can also cause this. It can also be caused by softer wood with long fibers that tend to bend and tear. If the imperfection is so minor that you can consistently brush it off with your finger or clean it up with a razor blade, I would be inclined to leave well-enough alone, but pay close attention to the particular moldings that are giving you trouble to see if you can ascertain the exact cause.
 
(I wanted a real reply first before I said this....)

Who's Harry Rabbets, and is he teaching a class at WCAF????







Welcome to the Grumble :party:
 
wvframer said:
Sometimes this is caused by too much space between the support and the rabbet. Try tightening this up on the moldings that are giving you trouble. It may cause the molding to bind a bit, but frequently eliminates the splitting. Sometimes a small amount of lubricant will get you a cleaner cut. If you are cutting moldings with compo, the blades will need to be sharpened much more frequently and a dull blade can also cause this. It can also be caused by softer wood with long fibers that tend to bend and tear. If the imperfection is so minor that you can consistently brush it off with your finger or clean it up with a razor blade, I would be inclined to leave well-enough alone, but pay close attention to the particular moldings that are giving you trouble to see if you can ascertain the exact cause.
Click to expand...
Thanks wv. I'll tighten the space a bit and pay attention to the mouldings. If it's consistent, then I guess I'll have to put on new blades. Thanks again.

Kindly,

Susan
 
W.C.Framer said:
(I wanted a real reply first before I said this....)

Who's Harry Rabbets, and is he teaching a class at WCAF????







Welcome to the Grumble :party:
Click to expand...
Thanks for the welcome! You gotta be quick to see Harry Rabbets, so he might be at WCAF! He might be a 'she rabbet'............

LOL!
Susan
 
1000 cuts is a lotta cuts, even if you're counting individual bite size nibbles instead of completed miter cuts. Time to Get Them Sharpened!

Besides making sure the rabbet support height is correct, for chip prone mouldings it can helpful to interpolate between the last two indents, so that the final three cuts are nothing more than very fine shaves, even finer than normal. Not all Morso's will stay put between the last two indents, but the one I work with now is happy to do so and the finely shaved cuts are exceptionally smooth and crisp and chip-free even with somewhat dull blades. Also useful for moulding that tends to fracture, such as polys.
 
sometimes even with a new blade the crappy moulding will do that...you have to try to find a spot that has decent wood..of course you go thru a lot of length that way.....sawing helps sometimes or maybe buy better quality moulding ( if you can find it)
 
Been chopping moulding for 30+ years and the little bit of feathering from the rabbet shoulder is SOP as far as I know. The rabbet supports leave about 1/8" of material unsupported and it would be natural for that piece to fray a bit from the downward pressure of the blades.
We clean it up with a sanding stick or razor knife.
 
The correct term is furry rabbets.

Harry Rabbets is an adult film star.
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I would check the rabbet support and make sure it is firm under the rabbet.

Bob
 
Hello everybody, my first post on here. I have been using a Morso for a few years now and what has been described is quite normal and the amount of feathering will depend on the quality of moulding used.

Simply use a sharp blade to trim back, not to do so could leave a pressure point for any glass and make it more prone to breaking.

Away from the subject of this thread but I really enjoy reading your posts a looking at some great frames.

Steve
 
Away from the subject of this thread but I really enjoy reading your posts a looking at some great frames.

Steve[/QUOTE]

Welcome to the Grumbler Steve. There is a wealth of information here and a great group of people here.

Dan
 
Away from the subject of this thread but I really enjoy reading your posts a looking at some great frames.

Steve[/QUOTE]


Welcome aboard Steve. Sound advice and a helping hand are always welcome here. :icon21:
 
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