Ask The Trades - COVING ON A MITRE SAW.

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Ask The Trades › DIY Forum › Carpentry Questions › COVING ON A MITRE SAW.

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COVING ON A MITRE SAW. (Read 20089 times)

Dusty Junior Member Offline Grrrrrrrrrrrr Posts: 39 Total Thanks: 0 For This Post: 0 Gender:	COVING ON A MITRE SAW. May 16^th, 2004, 2:26pm Like many others I have a power mitre saw. Great bit of kit, cuts timber at an angle and tilts. It also cuts plaster coving beautifully. Can�t quite seem to get the combination of angle and tilt quite right. Does anyone know the angles to use to set it up, to cut coving when its laid flat on the mitre bed? Thanks Dusty.
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big_all Global Moderator Trade Member Author Offline heeelllooo Posts: 5596 Total Thanks: 10 For This Post: 0 Gender: Trade: Joiner	Re: COVING ON A MITRE SAW. Reply #1 - May 16^th, 2004, 2:30pm helllooo dusty this was coverd yesterday ill look for it ??? ??? its under funny enough mitres on cornises
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Dewy

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Re: COVING ON A MITRE SAW.
Reply #2 - May 16^th, 2004, 4:08pm

Here you go Dusty. This was asked on the trade forum.

[quote author=WOLF link=1084386414/0#8 date=1084491267]Simple!!!!!!!!!!!!!!!
the answer to the question of a wide cornice, laid flat, what angles to cut at is as follows......

the vertical angle for a 45/45 cut is 35.3 degs and the horizontal angle is 30 degs
basic trigonmetry dear fellows.... call your selves chippies.... OOOOOOOOOOOOPPPPPPPSSSS! sorry forgot, they have not taught trig at schools/colleges for a bloody long time... god am i showing my age or what...!!!!!
which is why you will find on the real quality powered and non-powered mitrew saws the following angles... 31.6/33.9 and of course 35.3 degrees.....
now you lot know!!!!!
regards the over worked matt Shocked

[/quote]
Thanks go to WOLF for the answer. Cheesy

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Windy Miller Trade Member Offline Posts: 396 Total Thanks: 0 For This Post: 0 Gender: Trade: Handyman	Re: COVING ON A MITRE SAW. Reply #3 - May 16^th, 2004, 9:15pm Mire saws are great for cutting coving, but remember to brush away the plaster 'sawdust' from the saw, as it sets hard in no time and it's a bugger to get off! Windy
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Dusty Junior Member Offline Grrrrrrrrrrrr Posts: 39 Total Thanks: 0 For This Post: 0 Gender:	Re: COVING ON A MITRE SAW. Reply #4 - May 17^th, 2004, 9:42am Thanks guys, most helpful. There should be a section on this forum for data like this so people like me don't keep asking the same question.
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garyclay

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Re: COVING ON A MITRE SAW.
Reply #5 - Oct 26^th, 2004, 8:36pm

If the corners aren't 90 degrees, and they usually are not I use the table from this site that I printed out. Have a look at

http://www.dewalt.com/us/articles/article.asp?Site=woodworking&ID=2

Table is at the bottom of the page. Useful pics too. No doubt all you pros knew this but for DIY numpties like me it was a life saver!!!

« Last Edit: Oct 26^th, 2004, 8:37pm by garyclay »

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woodsmith Global Moderator Trade Member Author Online Posts: 4395 Total Thanks: 135 For This Post: 0 Gender: Trade: Joiner	Re: COVING ON A MITRE SAW. Reply #6 - Oct 26^th, 2004, 9:50pm Thanks for that link Gary and welcome to the forum. There is a formula for working this out, but the chart looks a lot easier to use. Keith
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Dewy

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Re: COVING ON A MITRE SAW.
Reply #7 - Oct 26^th, 2004, 10:30pm

Those charts remind me of my youth when learning my trade.
A great part of our work was producing angles, either by stepping them using tangents or tilting the cutter.
Very often the cutter had to be tilted at an angle instead of square to the datum line.
I asked everyone if there was a way to calculate this angle to produce the required one in a different plane and non of the skilled men, foremen or draughtsmen knew.
I got hold of a book of tables and worked the angle out the long way and realised that one of the steps gave the natural secant of the angle.
I soon had a formiula that I used for finding any angle needed from whatever point I approached the job from and marked every finished angle in a notebook that became my bible.
Others plus the management regualarly asked me how I managed to work so accurately and my only reply was "I calculated the angles"
Noone ever did see my 'bible' or if they did they had no idea what all the figures were for. lol

The formula was the same as needed to produce the figures used on that DeWalt site.

A cotangent multiplied by the reciprocal of another cotangent to find the cotan of a cosine was not my idea of fun. ???

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JerryD GDPR opt-out Total Thanks: 135 For This Post: 0	Re: COVING ON A MITRE SAW. Reply #8 - Oct 26^th, 2004, 10:38pm [quote author=Dewy link=1084714016/0#7 date=1098826213] A cotangent multiplied by the reciprocal of another cotangent to find the cotan of a cosine was not my idea of fun. �??? [/quote] I had one of them, but the wheels fell off ??? ??? ???
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Kesh Trade Member Offline Posts: 321 Total Thanks: 0 For This Post: 0 Gender: Trade: Not Specified	Re: COVING ON A MITRE SAW. Reply #9 - Oct 27^th, 2004, 11:48pm He he, you could aways do it by "eye" - What do you think they invented "polyfilla" for!
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big_all Global Moderator Trade Member Author Offline heeelllooo Posts: 5596 Total Thanks: 10 For This Post: 0 Gender: Trade: Joiner	Re: COVING ON A MITRE SAW. Reply #10 - Oct 28^th, 2004, 12:47am you lazy bu66er you are supposed to do it 95% then use filler
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Dewy GDPR opt-out Total Thanks: 10 For This Post: 0	Re: COVING ON A MITRE SAW. Reply #11 - Oct 28^th, 2004, 12:53am I just KNEW I was doing something wrong. I thought it was 5% wood with 95% polyfilla.
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big_all Global Moderator Trade Member Author Offline heeelllooo Posts: 5596 Total Thanks: 10 For This Post: 0 Gender: Trade: Joiner	Re: COVING ON A MITRE SAW. Reply #12 - Oct 28^th, 2004, 1:18am well as you know filler in good woodwork is not allowed[less than 1%]but in the real world 2 or 3 %[5%at a push]is ok
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splinter

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Re: COVING ON A MITRE SAW.
Reply #13 - Oct 29^th, 2004, 11:31pm

[quote author=garyclay link=1084714016/0#5 date=1098819370]If the corners aren't 90 degrees, and they usually are not I use the table from this site that I printed out. Have a look at

http://www.dewalt.com/us/articles/article.asp?Site=woodworking&ID=2

Table is at the bottom of the page. Useful pics too. No doubt all you pros knew this but for DIY numpties like me it was a life saver!!! [/quote]

What is the idea of the 52/38 degree crown moulding mitre cut

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Dewy GDPR opt-out Total Thanks: 10 For This Post: 0	Re: COVING ON A MITRE SAW. Reply #14 - Oct 29^th, 2004, 11:42pm The angles on the chart are what you set the mitre saw to when laying the moulding flat on the table
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jasonB GDPR opt-out Total Thanks: 10 For This Post: 0	Re: COVING ON A MITRE SAW. Reply #15 - Oct 30^th, 2004, 8:12am splinter, 52/38 deg refers to a crown moulding where one leg, usually the bottom is longer than the other unlike regular cove which has equal legs. If you drew an imaginary line through where the ends of the moulding meet the wall it would form a triangle 52/90/38 as opposed to 45/90/45. Jason
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garyclay

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Re: COVING ON A MITRE SAW.
Reply #16 - Oct 30^th, 2004, 8:54am

The 52/38 refers to a type of moulding that doesn't sit at 45 degrees to the wall and ceiling. 52/38 is what is known as the spring angle. With these mouldings they sit lower on the wall and less on the ceiling, or vice versa.

These are less common in the uk at the moment.

Find out more about spring angles and get a load more coving tips at another cracking site I found

http://www.altereagle.com/How_to_install.html

Hope that helps.

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Ask The Trades › DIY Forum › Carpentry Questions › COVING ON A MITRE SAW.