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Need help with front Bulkhead

want2race - 31/12/04 at 02:16 PM

Those LA, LB etc pieces are confusing me.

My gut feeling is that there should be a prevalence of a compound angle but I have never seen a drawing show this.

Can anyone offer me any advice or a site to guide me before i start making this piece a compounding problem..

Thanks'

Hellfire - 31/12/04 at 03:08 PM

Maybe a little more information is needed to gain some useful advice?

I always found the best way to gain trust and respect, is to pander to the experience of others especially when you are a newbie.

Just a little guidance in the grand scheme of things!

Welcome to the LB forum - you'll find all of us a happy, jovial bunch (with exceptions ) who basically have nothing else to do than wander through the many postings looking for a question that can be answered.

Certain styles of asking questions seem to generate very little response...

Have fun with your build

want2race - 31/12/04 at 03:44 PM

quote:
Originally posted by Hellfire
Maybe a little more information is needed to gain some useful advice?

I always found the best way to gain trust and respect, is to pander to the experience of others especially when you are a newbie.

Just a little guidance in the grand scheme of things!

Welcome to the LB forum - you'll find all of us a happy, jovial bunch (with exceptions ) who basically have nothing else to do than wander through the many postings looking for a question that can be answered.

Certain styles of asking questions seem to generate very little response...

Have fun with your build

Ok lets take a tunk.

I followed the boks measurements but in order for the pieces to meet on the same plane of the piece of metal I would have to have a front bulkhead compound cut.

http://mcsorley.net/locost/images/FrontEndAssembly.gif

That sthe section I am working on and cannot work out whats wrong for the life of me unless its a. a compound angle or b its not going to sit on the plane of the tube

Peteff - 31/12/04 at 04:01 PM

It's a compound angle both ends of la and lb.

[Edited on 31/12/04 by Peteff]

britishtrident - 31/12/04 at 04:14 PM

The 1st Edition of the book had conflicting info on the front frame design in particular how LC sits in relation to the horizontal when viewed in side elevation --- I am pretty sure at least some of the errors are still in the second edition

Inspite of doing some 3d trig and my best to get the compound angle cut correctly to get mine spot on I did some quite subtle hot bending of LA and LB to get LC sitting square when viewed from the side.

chrisf - 31/12/04 at 07:18 PM

The compound cuts you're talking about do require a bit of spatial ability. My impression is that you are having a bit of trouble with this part. You could cut the compound cut by hand using a hack saw; which is what I would do if I were building the assembly again. I used a compound miter saw, which you could rent from Home Depot and put a metal cut off wheel on it (I bought mine and it broke just before chassis completion). Alternatively, you can use a band saw. You can tilt the table to the required first angle, then use the sliding protractor for the second angle.

I cut mine a few mm long and used a bench grinder to get the proper fit. I also screwed up a couple times, as I'm sure others have as well. I don't remember being so intimidated, though.

--Hope this helps, Chris

kb58 - 31/12/04 at 09:35 PM

quote:
Originally posted by chrisf
... I also screwed up a couple times, as I'm sure others have as well....

Nope, only you

want2race - 31/12/04 at 09:59 PM

well since I have screwed this piece up. I now want to know what the best cutting tool is to use.. Bandsaw and Chop saw have failed me!

What has angle markings on its base that are clear as day ?

gazza285 - 31/12/04 at 10:27 PM

quote:
Originally posted by kb58

quote:
Originally posted by chrisf
... I also screwed up a couple times, as I'm sure others have as well....

Nope, only you

I've seen your website.

kb58 - 1/1/05 at 03:03 AM

You don't know the half of it...

Cita - 1/1/05 at 08:22 AM

quote:
Originally posted by chrisf
..... I also screwed up a couple times, as I'm sure others have as well.

--Hope this helps, Chris

I do that on a regulare base

britishtrident - 1/1/05 at 11:05 AM

quote:
Originally posted by want2race
well since I have screwed this piece up. I now want to know what the best cutting tool is to use.. Bandsaw and Chop saw have failed me!

What has angle markings on its base that are clear as day ?

Short of using a NC machine to cut the compound angles they will always be out and in any case don't trust the book measurements apart from being an amalgam of several chassis the drawings have been partly done in imperial and partly in metric, so no other course but work them out for your self.

After that mark out LA and LB properly, cut by hacksaw leaving each section slightly over size, finish the lower ends with a flat file clamp to the jig and weld to LD. Tack weld and check for accuracy if OK fully weld to LD. Remove from jig and check angles , if only slightly out some gentle hot bend of LA and LB close to the weld with LD may be enough .

The next stage is relatively easy, by placing the partly complete assembly in the jig you can see exactly how much metal to remove and the angles to file/cut at.
After that clamp it firmly down to the jig and tack weld on LC . now remove and check against the chassis. If it checks out clamp down firmly and fully weld.

Now offer it back up to the chassis -- and make any adjustments required,

Mark Allanson - 1/1/05 at 01:41 PM

An easy way to get the job done is to print up the relevant drawing from Mcsorleys plans, cut them out and use as a template. Lay the members on your jig, tack ONCE at either end and use a straight edge to ensure the tubes are lined up with the centreline of the chassis, twist with an adjustable spanner if necessary, then add the other 12 tacks. Garnish and serve!
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