Steve Hignett
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| posted on 4/1/11 at 05:37 PM |
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SolidWorks Help please!
Hi All,
I really should learn it I know, but I'm trying to draw the two items from my crappy sketch below.
I'm planning on making a petty strut brace using carbon fibre tube and machined titanium ends, and wanted to draw it first...
The upper one is relatively straight forward (well, not easy enough for me to do it!), it just wants a saddle type bracket going round the Rear Diag.
brace standard location, but the lower one is to have a single sided leg coming off to use a caphead bolt going through to the Caterham's top
rail (standard fitment point) hence the funny angle.
Embarrasingly enough, all I've managed to draw (after 15 mins looking!) is the hollow cylinder base that would go through into either end of the
tube, and immediately got stuck doing the hard stuff!!!
Here's a snap of what I've got already;
Here's my dodgy sketch of what I need to learn to draw; (Lower on left, Upper on right)
And this is what it'll be going on...
Thanks in advance for all suggestions and advice,
Steve
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mads
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| posted on 4/1/11 at 05:48 PM |
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Steve,
Has Alex seen this yet? If not, he will soil his pants with the amount of CF in that photo alone!! 
We gain knowledge faster than we do wisdom!
Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in
sideways, thoroughly used, totally worn out and loudly proclaiming... "f*ck, what a trip!"
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balidey
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| posted on 4/1/11 at 06:00 PM |
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Not at work now, but will try and explain how I would do it.
1st draw a vertical centre line.
Then draw half the profile to the largest diameter (ie you model how you will make it, so largest bar stock turned down).
Then rotate a solid, so you have a round part.
Then a sketch on the front plane and sketch what you want removing, then extrude a cut forwards and backwards.
Then you should have the part and you can then add holes onto the newly cut faces.
If i was at work I could have done it in a couple of mins and done screen grabs to help explain. If you haven't got it sorted by tomorrow AM
then I'll do that for you.
Dutch bears have terrible skin due to their clogged paws
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balidey
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| posted on 4/1/11 at 06:09 PM |
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As an aside, is there any need for a brace?
I know it will look pretty and be in light material, but have these type cars actually got a need for bracing. Surely the chassis itself does a better
job than this add on part?
And this is not a 'dig', just curious to find out why you want to do it?
Surely if you want to add CF, then perhaps a cup holder?
Dutch bears have terrible skin due to their clogged paws
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orton1966
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| posted on 4/1/11 at 06:14 PM |
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A couple of ideas
There is often more than one way to do these things and it often doesn’t matter how you get at the result until you want to make changes but on such a
simple shape it doesn’t really matter. I’m no expert and stumble my way though but I do see a couple of ways to do the models you want:
The crudest and easiest is form an extrude boss/base (on top of what you have already drawn) in one plane (choose the mid plane option) to give a
block with the correct outside profile, next chose a plane or face, at 90 degrees to the first, so if you did the block working on the right plane, go
to the front plane. Here do an extruded cut to take the part of the block you don’t need away. Finish by filleting any edges that need it.
Another way is to do the flanges by offsetting from a plane for the extrude or if the shape was harder create a new plane.
Just have a bit of a play but with relatively simple shapes don’t get hung up on doing them a particular way
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balidey
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| posted on 4/1/11 at 06:19 PM |
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I do agree with most of what orton1966 said, there are always more then 1 way of doing things in SW.
But from vast experience using it, I find the best approach is always to model it like you would make it.
And in this case it would almost certainly be turned down to the maximum profile shape and then a mill to cut front to back to add the shaping you
want, then any cross drilled holes added.
ie treat every operation in the model as a 'real life' operation.
Personally I think extruding shapes onto that base would not give the best results in this case.
Dutch bears have terrible skin due to their clogged paws
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FASTdan
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| posted on 4/1/11 at 07:25 PM |
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I can see your problem right away.......solid works lol. get inventor, proper software I tell thee.
No seriously if I get chance and your not sorted ill have a look shortly.
NEW danST WEBSITE NOW LIVE! Bike carbs, throttle bodies and more......
http://www.danstengineering.co.uk/
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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orton1966
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| posted on 4/1/11 at 07:32 PM |
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quote:
Originally posted by balidey
I find the best approach is always to model it like you would make it.
And in this case it would almost certainly be turned down to the maximum profile shape and then a mill to cut front to back to add the shaping you
want, then any cross drilled holes added.
ie treat every operation in the model as a 'real life' operation.
Agreed
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indykid
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| posted on 4/1/11 at 09:20 PM |
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quote:
Originally posted by orton1966
quote:
Originally posted by balidey
I find the best approach is always to model it like you would make it.
And in this case it would almost certainly be turned down to the maximum profile shape and then a mill to cut front to back to add the shaping you
want, then any cross drilled holes added.
ie treat every operation in the model as a 'real life' operation.
Agreed
Thirded
I had a go for you, took about 20 minutes but that was more second guessing dimensions and using a mouse on the sofa next to my laptop
- extrude the bar stock on the top plane
- sketch the revolved cut on one of the vertical planes, revolve the sketch (select view>temporary axes to get the axis of revolution)
- sketch the revolved cut for the internal bore, revolve as above
- select right plane and sketch the shape of the lug, make a 2 direction extruded cut through all
- select the front plane, sketch the shape of the slot and the faces of the clevis, extruded cut as above
- select hole wizard, make a clearance hole to suit the clevis bolt. (i had to make the centre of the hole and the o.d of the clevis lug concentric
because it didn't like it being aligned with the temporary axis, but you can position yours to suit)
- press space, select isometric, check it looks right, add any fillets and chamfers
- done
[Edited on 4/1/11 by indykid]
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FASTdan
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| posted on 4/1/11 at 10:27 PM |
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I may have misunderstood, thought you wanted the angled one drawing. Anyway, if you did heres my interpretation (with guessed dimensions)
Just learning SW as im an IV user day to day.
[Edited on 4/1/11 by FASTdan]
NEW danST WEBSITE NOW LIVE! Bike carbs, throttle bodies and more......
http://www.danstengineering.co.uk/
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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Steve Hignett
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| posted on 5/1/11 at 08:38 AM |
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Thanks for all replies so far!!!
Mads;- I daren't talk Alex into anymore CF as he'll prob beat me about the head if I do - He know's where I am and what I do 
Baliday;- Need for the brace? Well I'd say it was 25% me wanting to do it, 25% for it being there to look amazing, and 50% need for it. The car
will only weigh 440kg ish, but it'll have between 550 and 600 hp so it will be a pretty powerful car and in my humble opinion, benefit from some
stiffening in the most open area of the car...
Fastdan;- you're (sort of) not wrong, I need help on both of them, but I did say above that I'd find the single sided one more
difficult!
Baliday/Orton/IKid/FDan;- Thanks for having a crack! I wish I was little more PCProgramme-minded!!! Most of the time, even if I do learn stuff I need
reminding how to do it. I guess it doesn't help only having an QI of 69
I will have a go now, and report back on my attempts!!! Main problem is that I use the programme so infrequently that I don't know where stuff
is!
Anyway, thanks for advice so far, I will try and follow your brief guides...
Steve
ps as for sizes, I don't have any myself yet as I haven't ordered the tube, was going to have one made just for me with a really fat
weave, like a 4x4 twill  but I haven't told the person who's paying any of this yet 
[Edited on 5/1/11 by Steve Hignett]
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Steve Hignett
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| posted on 5/1/11 at 11:27 AM |
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Hey guys,
My little boy is v poorly at the moment so I can't get on the pc as Its In the "nursery/office/2nd bedroom"
But, I must be doing something stupidly wrong as I started to do as per some suggestions above:
Went to.right plane, drew a rectangle, extruded it 60mm mid plane so it was central to the lower twin barrels cylinder. BUT when I then went to
extrude the centre out of It In eithrr right or centre plane it greyed out all the options an highlighted Exit Sketch
???
Thanks again...
[Edited on 5/1/11 by Steve Hignett]
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MikeCapon
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| posted on 5/1/11 at 11:57 AM |
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Because you need to have exited the sketch before you can use it to extrude?
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balidey
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| posted on 5/1/11 at 12:10 PM |
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Sounds like you have gone to edit an existing sketch of an existing feature, ie instead of a new sketch to then create a new extrude you may be in
another one, so it needs you to exit the sketch.
Also I have had a quick stab at the angled item. Its a very odd shape when you start to model it. To give you a nice shape to the top lug you need to
do a secondary mill operation on the top. Couple of sketches attached.
Dutch bears have terrible skin due to their clogged paws
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balidey
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| posted on 5/1/11 at 12:21 PM |
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Also, rather than machining the twin leg item, you do realise its actually just a clevis and you will be able to get one off the shelf? Maybe not in
Ti but TBH a steel or even larger alloy item will not weigh any more.
And instead of the angled item I would look into whether another clevis and a rose joint would give you the angle you need, much better than machining
that horrible shape and wasting all that Ti
Dutch bears have terrible skin due to their clogged paws
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Steve Hignett
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| posted on 5/1/11 at 12:41 PM |
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Mike:- I thought that at first so I deleted and started again to get the same result! It's obviously just me doing something wrong, but I am
totally clueless re SW (and all programmes TBH!)
Balidey:- Thanks again for the sketches...
I've just had a crack at it and there some very obvious things I'm not able to conceive in SW...
I've just progressed to drawing a cone on top, then a filleted cuboid on top of that with a hole through it - I haven't tried to extrude
the centre out of that yet, as that's when I just noticed your replies!
It's not pretty though! It doesn't meet the existing disc and I don't know how to make it meet either! I'll include a
screenshot, but not much point as it is SO wrong!
With re. the necessity of it, no it isn't worth doing it in Titanium. Ali would be fine, one off the shelf would be fine too, assuming one fit
the rear diag. and the CF tube...
BUT, I want to try and learn SW a little at a time if I can, and that was one reason, the other is that I can prob get the material and machining done
for free if I really tried as one of our customers is a machine shop for the F1 and Aerospace industry and we've worked hard to satisfy an order
that he couldn't fulfill.
With re the lower, my first thought was indeed a rosejoint (it would also allow me a bit of discrepancy in the length of the tube, should anything be
out a tiny amount). But I think the angle is going to be too extreme. Will have to check though - does anyone have a link to any RJ articulation
tables per RJ size?
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Steve Hignett
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| posted on 5/1/11 at 12:46 PM |
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balidey
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| posted on 5/1/11 at 12:50 PM |
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ok, I see what you mean about it not meeting now.
What you have done on the lower part is a turned item, lets say for arguments sake its 50mm dia.
You then extruded a block off the top of that, which is smaller than the outer dia of 50mm, so it looks like its been added, where as to make this you
will start with a bigger lump and remove material. Like I said, model it as you make it. Will try and explain quickly in a minute with some sketches.
Dutch bears have terrible skin due to their clogged paws
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balidey
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| posted on 5/1/11 at 12:57 PM |
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this is how i would do it...
Dutch bears have terrible skin due to their clogged paws
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Steve Hignett
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| posted on 5/1/11 at 01:08 PM |
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U2U sented!!
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Liam
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| posted on 5/1/11 at 01:15 PM |
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For learning solidworks have you gone through the included tutorials? They're pretty good and I'd have thought that if you'd gone
through those you would find this fairly easy.
Also, just for my own curiosity's sake I'm wondering if you could indicate where this brace is going on a chassis pic as I'm
struggling to tell from your description. I'm wondering if it's really going to do anything structurally, especially with one end being
that angled tab.
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Steve Hignett
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| posted on 5/1/11 at 01:20 PM |
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I have tried the tutorials (a long time ago) but I fear you are underestimating my stupidity!!!
When I learn something, I only just grasp it, yet when I go back to it 12 months later, it's forgotten...
Programmes and myself have never ever got on....................
I can't modify the above photo well enough, so here's the first car I built with a very similar one fitted...
.JPG)
.JPG)
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balidey
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| posted on 5/1/11 at 01:24 PM |
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You don't like passengers do you?
I thought this was a suspension brace. Now it makes sense. I'll give you a call shortly.
Dutch bears have terrible skin due to their clogged paws
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Steve Hignett
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| posted on 5/1/11 at 01:35 PM |
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Passengers... Passengers???
To be fair this latest one is in a pretty high spec car and I think it'll prob be needed!!!
Waiting by the phone
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Steve Hignett
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| posted on 5/1/11 at 02:12 PM |
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OK, simple one (sort of) done...
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