Hispano Suiza V8

[cnr6400]

 

[Zephyrin]

I often find that printing a part reveals a design fault or just an appearance flaw that I didn't catch in the drawing

So true for me too...

nice railway painting you have pinned above your desk...

[Vixen]

Hello Ron,

It's always nice when you can weave in a bit of the history. Brings the project to life, in a way.

The crankcase fabrication looks to have come out well. A good solid, perfectly square base on which to build the rest of the engine.

Cheers

Mike

[RReid]

Thanks CNR!

nice railway painting you have pinned above your desk...

Thank you, Zephyrin. That was done by my eldest grandson some years ago. He's now just starting high school! Another one I like is just above it, done by another grandson, also some years ago.



I don't know where he got the idea for that, but I thought it clever!

Cheers Mike. I agree, I enjoy the extra "something" that learning about and sharing the back-stories brings to a project.

[ddmckee54]

Ron:

Couple of 3D printing questions for you:
1 - What are you using for a slicer?
2 - Do you scale the model over-sized to allow for shrinkage when the part cools?

The reason I'm asking is that I've been using Simplify3D as my slicer for a number of years and when I scale a part to allow for shrinkage all the external dimensions will be as close to spot-on as you can get with an FDM printer.  But, all the internal bores and pockets will be undersized.  Do you have that issue?

Don

[RReid]

Hello Don,

I'm using Bambu Studio, the native slicer that came with the machine. It works quite well, and is easy to use for a beginner like me. Most of the default settings seem to be quite good so I haven't played with the settings much, but tweaks are allowed if desired.

I haven't been scaling any of the parts, just printing them straight off the drawings. Printed dimensions are close (I really haven't been measuring most of them) and things fit together well enough for my purposes here. I'm not too worried about the dimensions being very precise, but for example, the printed crankshaft drops into the printed journals fine, but might be slightly tight for rotating. Some openings meant to take say a 1/8" shaft may need to be chased with a 1/8" drill to get said shaft to slide in snugly or an end mill or reamer to slide easily.

[RReid]

With the crankcase set-up on the tilting table with plenty of clamps, today I got one face drillled/bored to accept a set of cylinders. I started with drill bits, going up to 5/16”, then switched to the boring head to get to a final diameter of 0.816”, checked with a go/no-go gauge I turned up for the purpose.




Since the base of the crankcase was previously machined precisely to width, I thought I should be able to flip it around, and with it clamped against the same stop, be able to drill the other side along the same locked in Y location as the first face.

Once set-up, I was pleased to see that my sanity check scribe marks from the crankshaft centerline do in fact line up with the desired Y location. Yay! I used the pointer shown with the mill running to scribe a light reference centerline along the length of the face. You can just see it in the photo. All set for tomorrow.

[Admiral_dk]

Great progress Ron 

Per       

[fumopuc]

Very nice progress, Ron.

[Vixen]

Hello Ron,

So now the crankcase machining starts. Do you get apprehensive, like me, before you make that first cut?. Mark out, measure once, measure twice and measure again just in case, before you even start the spindle.

Again I can see the advantage of the 3D printed model. You immediately have something to test against the work, to check the fit and see how it is eventually going to look.

Nice work   

Mike   

[RReid]

Thank you Per, Achim, and Mike!

Do you get apprehensive, like me, before you make that first cut?

Oh yes, definitely! It doesn't help that the internal bearing supports are invisible from this set-up, but crowd right up to the edges of the bores. But where I have learned I REALLY have to be careful is doing the second side. In repeating a successful operation, I sometimes feel like "OK, I've got this now" and then - 

[Vixen]

Thank you Per, Achim, and Mike!

Do you get apprehensive, like me, before you make that first cut?

Oh yes, definitely! It doesn't help that the internal bearing supports are invisible from this set-up, but crowd right up to the edges of the bores. But where I have learned I REALLY have to be careful is doing the second side. In repeating a successful operation, I sometimes feel like "OK, I've got this now" and then - 

Hello Ron,

As I said elsewhere " you have to learn to trust yourself and trust your drawing" especially when dealing with hidden or invisible features. Your 3D CAD modeling skills will be a great asset to producing trustworthy drawings.

Mike

[RReid]

It's the loose nut holding the cranks that I most worry about...

[Admiral_dk]

It's the loose nut holding the cranks that I most worry about...

       

Per                     

[Art K]

Ron,
Moving right along on this one. I like the 3D printer to proof the concept, wish I had one.
Art