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1. 05:13 AM - Re: Autocad DWG Files (fritz)
2. 07:12 AM - Re: Re: Autocad DWG Files ()
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| Subject: | Re: Autocad DWG Files |
Gee Joe, with I few minor changes I could have given the same
reply.------ I think we are the type of people which Chris had in mind
when he designs his airplanes for the scratch builder. I used these
simple techinques on the 701 and 601, now doing the 750.
Best of luck,
Fritz
----- Original Message -----
From: joe motis
To: zenith750-list@matronics.com
Sent: Monday, January 18, 2010 12:08 AM
Subject: Re: Zenith750-List: Autocad DWG Files
Hi all,
I am building a 750 from plans.
A $ .99 clear plastic ruler, a good compass with a fine line sharpie
ty wrapped to it instead of the pencil, a couple of squares and a tape
measure will layout this entire airplane. Lightening holes are easy with
holesaws either in the drillpress or in a cordless drill. I started with
the wings and cut all the blanks for the nose and rear ribs with an
electric hand held shear and a pair of 12" Andy snips.The ribs were
formed with a deadblow hammer over plywood forms. I have started using
oak now, much more durable. The form blocks were all cut out on my
cheapo 14" bandsaw. Most all of the other fitments for the wings has
been cut out on a cheap bandsaw with a 14 tpi blade or with snips.A
woodcuuting bandsaw sings through .25 6061 like butter A 12' disc sander
and Harbor freight sanding drums in the drill press clean up all the saw
marks quickly. The wing spars which are made fromm 6061 T6 and were cut
with a straitedge and a Olfa linoleum cutter in less than an hour. The
spar flanges are 1" x 1" x .125 6061 T6 extrusion so no bending
required..As for bending flanges on your sheet metal, the cheap 18" and
30 " brakes from Harbor freight work fine and do a great deal of the
work required. They cost about $40 bucks each. I am building "Dave's
sheet metal brake"" now out of angle iron and piano hinge and it will
bend the channels and other larger sheet metal parts with no problem.
Most all of the fuselage sheet and wing skins can be roughed out with a
cheap electric or pneumatic shear and the fine line left to trim is no
work at all with a 12" pair of Andy snips.
My point is that simple tools will take you a long way down the road
in the construction of this airplane.
Joe Motis
plans built CH 750
NO ARCHIVE
On Sun, Jan 17, 2010 at 2:00 PM, Robert Pelland
<robert.pelland@cgocable.ca> wrote:
For starters, before we exchange any other messages, I would like to
know whom I am talking.
As for what parts that could not be sheared on your 8' shear, well
the list ( if I had time to make one up ) would certainly include the
main, and rear spars in the wings, then all the fuselage covering,
sides, top, bottom, ad to that all the major aluminum coverings on the
main wings, and there would surly be more if I had time to go over the
plans.
You are fortunate to have access to an 8' shear, but have you taken
the time source pricing an 8' wide shear. I have just purchased an 8'
Brown & Borg brake, and pricing on the shears was more expensive then
the brake itself.
As for the biggest challenge, it doesn't reside ( as you imply ) in
bending the spars flanges, since those are relivately easy with a decent
brake, but rather forming the flanges on the complete set of front and
rear ribs, that is where the real labor is !
But hey! there has be work involved somewhere in the construction,
else wise everyone would be building airplanes
regards
Robert
----- Original Message -----
From: John
To: zenith750-list@matronics.com
Sent: Sunday, January 17, 2010 3:51 PM
Subject: Re: Zenith750-List: Autocad DWG Files
Oh, ok! I didnt know the system had a vac table! I take back what
I said about the setup :)
As for the shear, which parts could not be cut on a 8' shear? I
have access to one, so that's "standard" for me. I think the biggest
challange for any metal wing project is bending the spar flanges, if
they have them.
I will check out the links. There's been many the time when I
wished for a CNC setup at home instead of doing "government" projects at
work.
On Jan 17, 2010, at 12:45 PM, "Robert Pelland"
<robert.pelland@cgocable.ca> wrote:
Thank's for your input, rcav8r,
but things are not always as they seem. For starters, the CNC "
Mechmate " once built, will also be used as an additional revenue source
for me, doing sub-work for local customers cutting thin, assorted metal
sheets and wood products.
As for the hold down problem you might think I will have, it's
actually non existent since the Mechmate has a complete vacuum system
installed under the table, and there are presently quite a few members
on the Mechmate forum, who are actually using the very same system I
plan on having, and are working with 12' aluminum sheets with no problem
what so ever. If in doubt, I can link you to a few who do this
regularly on aluminum sheets from .016, all the way up to 1/2" thick.
In as much as a shear is concerned, if you take a close look at
the plans, even though there are quite a few parts made up of straight
lines, few parts could be made using a regular shear, and I think a
shear wide enough to be useful, would not be costs effective.
Thank you for your concerns
regards
Robert
----- Original Message -----
From: rcav8r@charter.net
To: zenith750-list@matronics.com
Sent: Sunday, January 17, 2010 10:55 AM
Subject: Re: Zenith750-List: Autocad DWG Files
Speaking as a machinist:
You might find it impractical to try to cut sheet metal on a
mill type setup. Your biggest problem is work hold down, es. a 4x12
sheet. Even if you use a reverse spiral bit so it doesn't pull the sheet
up, you'll still have tremendous vibration of the sheet if you don't
have some kind of hold down along the path of the cut.
A better way to go would be to come up with some sort of CNC
punch head for it, punch the the rivet and screw holes, then us them as
some system to clamp the sheet metal down while you mill the part out.
all of this however, is probably gilding the lilly. IIRC from
my 701 plans (don't have them anymore, and don't have 750 plans at this
time), most of the sheet parts besides the ribs are straight cut, and
could be cut on a shear.
The ribs could be cut with a waterjet ($$$) if you have the
CAD files. With all the time and money involved, I'd rather spend the
money on sub kits from Zenith.
I know this is not what you were asking, but you are going
through a lot of trouble for very little return.
---- stepinwolf <robert.pelland@cgocable.ca> wrote:
<robert.pelland@cgocable.ca>
>
> I am a 701 & 750 scratch builder, and in order to make
things more interesting for my 750 build, I am planing, among other
things, to build a CNC machine in the coming year. The " MechMate " unit
( check out the following site ) http://www.mechmate.com/ will be built
with a 5' x 12' table, so that complete 12' aluminum sheets can be
process by the machine.
>
> My question to fellow Matronics List members is this. Does
anyone have, or have access to Autocad DWG files for the 750, that they
would be willing to share.? I am quite aware that I can spend my time
drawing them myself, however my time would be better spent assembling,
and flying, then by spending weeks in front of the keyboard, drawing DWG
files that have already been done by someone else.
>
> If I were to get help in obtaining the necessary 750, or
even the 701's files for that matter, cutting out assorted parts for a
fellow builder's would not be out of question.
>
> A big thank you, to all those of you, who will take the time
to address my concerns.
>
> Robert
> the 701&750 scratch.
>
> www.autoretro.info
>
> --------
> Live each day, as if it was your last
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=281889#281889
>
>
>
>
>
>
>
>
>
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| Subject: | Re: Autocad DWG Files |
That Macsmachine website brake is the one I was referring to also. I also have
the parts for the 4' brake you mentioned, but I never put it together (yet).
When I had the 701 plans, I was looking at potential LSA plane. The rules weren't
final at the time, and everyone was thinking it would be 1200# gross.
Flash forward to today, although my project is a Bearhawk, I am keeping an eye
out on LSA's again, "just in case". I have some requirements though: must be able
to be scratch built, have side by side seating, high wing, tube and fabric
fuselage, and be actually designed around the LSA rules (not just a beefed up
smaller design). The 750 is the best compromise of these (probably the ONLY compromise).
It doesn't have the tube and fabric fuse, and not really designed
around LSA (but it actually has a practical useful load for 2 people and some
baggage).
If I actually do a 750, I will remove the leading edge strakes, and probably modify
the nose ribs as some people have done with the 701 and doing with the 750.
I don't really need the ultra STOL capabilities.
---- stepinwolf <robert.pelland@cgocable.ca> wrote:
>
> Please to make your acquaintance John, I live in Three Rivers, Quebec, just North
of the US border, about two hours drive, from Champlain New York.
>
> Personally I did not decide to go with the 701 or 750 for the gross weight, the
load carrying or the STOL capacity, but rather because they are all aluminum
aircraft, and by the same token, easy to build, and easy to repair. The fact
that they can be left outside without any protection were not initially part
of my decision.
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