morso pushing problem

[elly-d]

hey, i bought a new morso in december, after my old one gave out, and i haven't cut a decent frame since. on its original set up it was cutting and leaving a gap at the back on soft woods so i set it correctly by moving the fence, but on hardwoods it leaves a huge gap on the inner edge of the mitre. anyway i figured out that the blades must be pushing the moulding or that the moulding is pushing the blades back, let me try to explain.

i was cutting a wide oak today, so i chomp through and you have two bits (im gonna call them a left and a right). on the last pass with the baldes, the slither cut, there is alot of resistance as the pressure seems too much. if i push the blades down and slide my left mirte to the left blade it touches all along very nicely, but when i slide the right hand piece to the right hand blade there is a 3-5mm gap on the front of the moulding (rebate edge). the measuring arm is tight as can be and this has been happening on all 3 sets of blades (lion sharpened). any ideas? anyone recognise this problem?

i spoke to someone at lion, i found it hard to explain the problem sufficiently, and they are gonna try and get an engineer to get in contact to come and see it but i fear that may take a long while, i am in dire need of help.

cheers
ellis.

[Roboframer]

It could be that the right hand fence is out of alignment, get a straight (steel) edge and lay it, and/or run it along the RH fence and the fixed measuring arm, there should be no gap from either and if there is the moulding can pivot, like a hinge, on the sliver that is left on the last cut.

[elly-d]

its all set up square and works fine on softer woods. the problem is the cut mitre is not the angle that the blades and fence are set at??? when the blades come down on the last cut it starts in the right place but forces the wood (or the blades) away so the resulting cut is distorted. so hard to explain.

[Roboframer]

Do the rebate supports move easily? It could be that they are tight against the rebate but not fully home on the last cut. Try it with no rebate supports; upside down if it's a flat profile.

[misterdiy]

Hi Ellie

Was this a brand new Morso?
Did it come assembled?
With fences removed and the blades pushed down through the bed, is there a gap between the blades and the bed?
Are the allen screws that hold the bed in place near the blades loose in any way?

This can be sorted - honest

Steve

[Gesso&Bole]

If it's fine on a softwood, it sounds like a rebate support problem to me. Try Robo's suggestion with no rebate supports

[easypopsgcf]

Have the blades been hollow ground?......Or are they new?

[prospero]

Sounds like blades to me.

What can happen if the blades are not properly ground (or a bit blunt) is that they can go off track on the final cut. Especially on hard wood. They may start off in the right place, but as they cut they end up skating over the surface toward the bottom rather than shaving a bit off. This produces just the binding effect you describe, as the edges are in fact being forced inward. This action tends to ruin the edge as well.
I would swap the blades for a fresh set and get the present ones reground asap. If the new set do the same, get them sharpened elsewhere.

[framingengineer]

Prospero is nearest the mark.
Try this test......take a wide flat profile and cut a couple of 6" bits. then trim first the left and then the right cut. While making a slow trim .... put your finger on the end of the moulding (away from the blades) and see if the moulding is being pushed away from the blades. You may find it only happens on one side. If it is being pushed away then it is definitely a blade problem.
The most common fault is what Lions describe as a 'hill' on the blades. This is a warping of the laminated front of the blade and effectively means the face of the blade is curved along its length....result is that the centre of the blade sticks out more than the ends so as you make the cut the centre of the blade pushes the moulding away this leaves a curved cut on your moulding.
Hope this helps.
If you are still stuck give me a call and I will see what I can do for you....!
Neil Stout
07793709123
framingengineer.com

[elly-d]

hi thanks for the replies.

unfortunatley this happens with all my sets of blades, which are all sharpened at lion. one pair is an old pair but two are brand new one set has only been sharpened once. you can feel the moulding being forced away on the final cut, on both sides. i put another pair on today and tried the moulding upside down with no rebates and it still happened.

[elly-d]

your right neil it does sound like a blade problem, and it feels like one too. but since i have tried multiple sets i am a bit stumped. does anyone else use lion for sharpening?

i will take your number to work tomorrow neil and i may give you a call. i will try and get lion on the phone first to see if they are sorting out this engineer they spoke of, couldnt get the guy on the phone all of today. its under warranty, the morso, and they sharpen the blades so hopefully they will sort it but if they are gonna waste more time....#

thanks guys.

[stevebowen]

Its a long shot as it does not sound like the answer but worth a try........

Have you tried moving the adjustment nut to move the blades into the fence more?
When I got a new morso, the blades only just penetrated the fence and caused a few problems but not what you are describing.

You can always place a thin piece of wood along the fence to move the oak out from the fence a little then see if it helps. If it does you can then make the adjustment.

[fineedge]

I took in four sets of blades for sharpening (including one reversible set) and when I got them back they were all stuffed up and performed like this - pushing the moulding outwards at the last trim - I eventually took some abrasive paper, stuck it to a thick piece of mirror lying flat on the work bench, and ground down the outer edge (which slides against the bed) of the blades (did it only with one set first) - it worked like charm - no more pushing outwards