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CNC Limits? #15857 06/11/08 05:18 PM
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mo Offline OP
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I have always wondered.. Are there limits to what these CNC machines can cut? Does the human hand still have the upper hand in some work?

Re: CNC Limits? [Re: mo] #15858 06/11/08 07:20 PM
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daiku Offline
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Square cornered mortises?


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Clark Bremer
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Re: CNC Limits? [Re: daiku] #15859 06/11/08 08:04 PM
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Ken Hume Offline
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Hi Mo,

Curved braces are still cut and fitted by hand.

Regards

Ken Hume


Looking back to see the way ahead !
Re: CNC Limits? [Re: Ken Hume] #15862 06/11/08 09:21 PM
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mo Offline OP
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hi guys, what about compound work and its sometime required acute angles?

Re: CNC Limits? [Re: mo] #15886 06/13/08 07:51 PM
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Treeax Offline
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There is no limits. At my work we have a 5 axis mill(CNC). It can cut any angle, compound angles and under cuts(over 45).

Re: CNC Limits? [Re: Treeax] #15892 06/14/08 10:27 AM
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TIMBEAL Offline
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I am guessing it can handle waney timber to a certain point. More likely the person running the machine wouldn't like wane. Which side does the cnc machine fall on the issue of wane? How about length. If there was room enough in front and back would it do 40'? Or are most of the frame designs for short timber? Crucks are out of the question. Tim

Re: CNC Limits? [Re: TIMBEAL] #16134 07/08/08 01:36 PM
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Timber Goddess Offline
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OMG! I only just noticed that this forum existed!
Where have I been?

OK, so...timbers should be cut square before hitting the machine. Wayne is ok on the edges, as long as the bottom surface of the timber is flat, the machine will cut it.
All measurements are taken from the center of the timber outwards, so if we're working with a 10"x10", I would take the average measurement of the timber, eg: top end of a 20' 10x10 is actually 9 7/8 x 9 3/4, butt end is 10 1/8 x 10...I would tell the machine that the timber is 10 x 9 7/8, and it will mill it accordingly. There is always a tolerance factored in, usually about 0.4 millimeters (y'all state-side can figure that one out yourselves).

The longest timber I have cut has been 39', and was limited to that only because of lack of space in the shop. Length isn't an issue, if there's room it will cut it.
Width, however, is limited to 20" (I think) because the clamps can only go so wide, and the tools only so high.

Crucks are out of the question, but logs are not. We fashioned rounded clamps to hold the logs, and had to rotate the log by hand for each "side", but it turned out a pretty cool product - log bents.

Let me know if I haven't explained clear enough, as I'm not very good at descriptive writing.....

*K

Re: CNC Limits? [Re: daiku] #16135 07/08/08 01:45 PM
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Timber Goddess Offline
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Originally Posted By: daiku
Square cornered mortises?


Yeah...the corners are chiseled out by hand. But when doing a through tenon there is a small chain mortiser on the machine which gets 'em. It has to be super-duper precise, though, as you could imagine, so these are set to cut with the tolerances off (-0.4 millimeters), so they fit tight, and will still need adjusting by hand.

Re: CNC Limits? [Re: Timber Goddess] #16489 08/10/08 06:55 AM
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Collin Beggs Offline
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cnc limits?

LIFE MEANING


"The lyf so short, the craft so long to lerne."
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Re: CNC Limits? [Re: Collin Beggs] #16490 08/10/08 06:57 AM
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cnc limts?

CRAFTSMANSHIP


"The lyf so short, the craft so long to lerne."
Geoffrey Chaucer (1343-1400)
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