muzchap
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| posted on 16/1/06 at 05:44 PM |
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Help - Compound Angles? CAD Masters - Help! :-)
Ok - trying to fabricate my own Engine mounts for the ZETEC into a Luego Chassis.
Now, the Inlet side - no problems - all measured and done.
The lovely exhaust side is causing me problems.
I've drawn a template - the forward facing face is the engine in the bay and the lower face is the chassis rail with engine mount on top.
I have the height it needs to be - 85mm
The far hand side of the engine mount plate needs to line up with the engine mount rubber - hence the central support going backwards towards the
mount rubber.
The distance from the engine mount plate and the engine mount rubber is 105mm - I'm going to the bolt on the engine mount rubber
Now - all angles need to be 90 degrees, but this angle will be compound..
Does anybody know of a way to calculate this - without using trial and error?
Hopefully the picture will help:
 
Template
[Edited on 16/1/06 by muzchap]
[Edited on 16/1/06 by muzchap]
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Aboardman
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| posted on 16/1/06 at 06:19 PM |
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how deep are the mounts,
you say mounts are flush with engine plate how far from centre of mounts to centre of engine plate,
if you have them I can do a drawing or do you just want a formula?
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muzchap
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| posted on 16/1/06 at 06:31 PM |
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Hi Aboardman...
Ok - looking at the diagram it's sh*t - I'm forced to use Paint at work - and it doesn't help.
The height is 85mm to the top of the engine mount rubber - It was 115mm to the chassis rail, but I deducted the height of the rubber.
Ok - I don't know the length from the plate to the rubber. The 105mm was centre of rubber to engine mount plate in a straight line - not taking
into account the 85mm height difference. (I got a ruler on top of the mount and put it across horizontally until it touched the block - then I
measured down from the engine plate. 
The shoulder of the engine mount rubber, lines up with the edge of the engine mount plate.
Hence the bar coming from the plate has to go backwards to the engine mount rubber.
Do you want me to measure the plate and the engine rubber to give you a better idea of all the components involved?
Cheers,
Murray
[Edited on 16/1/06 by muzchap]
[Edited on 16/1/06 by muzchap]
[Edited on 16/1/06 by muzchap]
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jon_boy
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| posted on 16/1/06 at 06:53 PM |
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I dont entirely understand what your trying to say (prob my fault not yours) but if you make it basic, ie a line that goes up 85 mm and across 120mm
then i can help!
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muzchap
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| posted on 16/1/06 at 07:40 PM |
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Hehe - I don't entirely understand myself.
What I wanted to do - because I couldn't make the mount - is give people a 'pattern' to work from.
So if you imagine you are looking at the engine block and the chassis rail - it might become clearer.
From the rubber mount i took a metal ruler and placed it to the block - i then took another metal ruler from the plate and put it on the ruler from
the rubber mount.
The measurements were height = 85mm and distance = 105mm
I don't know the diagnoal measurement 
I was more concerned with recreating an 'image' of the engine and block being in front of you - hence the attempt at 3-D modelling..
Cheers,
Murray
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Aboardman
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| posted on 16/1/06 at 07:43 PM |
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does this help
D3 = sqr (d1²+d2²) this will give you plan length
h2 = sqr (d3²+h1²) this will give a length along the slope of the mount however this is on the centre line.
angle x = (h1/d3) inv tan
angle x1 = 90 - angle x
angle y = (d1/d2) inv tan
angle y1 = 90 - angle y
these are the compound angles
and you need to allow for the cuts this will only give you a centre line.
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Aboardman
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| posted on 16/1/06 at 07:44 PM |
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how do i add an image as the above will not make sense ?
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muzchap
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| posted on 16/1/06 at 07:56 PM |
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Hi Aboardman,
You need to upload it to your photo archive - which you haven't activated yet :-)
So click on Photo Archive and then it will say - you don't have one - would you like to create - say yes.
Then browse to the image - hit upload - it'll upload then RIGHT CLICK on the picture - copy the URL and then post on here - press the insert
image button and paste in the URL you just copied - it should all appear then :-)
A bit of a kerfuffle :-( Sorry
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Aboardman
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| posted on 16/1/06 at 08:04 PM |
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http://locostbuilders.co.uk/photos.php?action=showphoto&photo=mount-Layout1.jpg
[Edited on 16/1/06 by Aboardman]
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muzchap
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| posted on 16/1/06 at 08:08 PM |
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Aboardman - that looks great - I'll get onto it now and start calculating! :-)
Many thanks for your time and effort on this - if I can ever help you - let me know 
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CairB
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| posted on 16/1/06 at 09:49 PM |
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I made mounts by positioning the engine, cutting and fitted plates to engine and top of mount.
Made a cardboard box section with the ID the same as the OD of the intended strut and square ends that fit between.
Taped pieces on to fill up to the plates.
Opened out the cardboard 'development', wrapped it around the box section and cut the compound angles.
Tack welded a 25 x 3 mm between the 2 pairs of plates to hold them in the correct relative location, adjusted slighlty to allow for slight pulling out
of aliignment.
Removed the plates and welded the struts, ground off the temporary 25x3.
Not a bit of CAD in sight
Cheers,
Colin
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