CNC Drawing Help!!!

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mark270981
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CNC Drawing Help!!!

Postby mark270981 » Wed May 27, 2015 5:06 pm

Hello

I have a project that requires a little bit of thought.

I need to create this. I am thinking to do it on the CNC but haven't got a scooby do - how to draw it up and tool path it?!

I did a sketchup model and imported that as a DXF in V carve pro, and be fair it has created a tool path, but not a useable one as there is no way of fixing the work piece down.

If the CNC doesn't work, I could use a band saw (which strangely enough I don't have one)

Image

and failing that if someone wants to give me a price for them - I have 900no to get made for about 10 days time.

all help appreciated.
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tusses
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Re: CNC Drawing Help!!!

Postby tusses » Wed May 27, 2015 5:27 pm

is that your client's dwg ?
not enough info to cut .. radii etc

if they have given you a dwg, can they supply the file ?

also, is that chamfered face ! ?

if you don't have a band saw (why ??? !!! ) could you template rout/shape

mark270981
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Re: CNC Drawing Help!!!

Postby mark270981 » Wed May 27, 2015 5:34 pm

Clients DWG, but it is easily replicable on CAD and yes its a chamfered tile 4 ways.

A bit of a head scratcher as doing on the CNC will take 150 hours of machining!!

So I reckon its a band saw job.

I can get 200m of profile cut by our machinest guy, who will also cut it to length for us!!

so all I will need to do it the radius to 4no corners and chamfer the ends.

I have started thinking that someone with a tenoner might do it, but the work piece is only 200 long so thats a no go!!

Why do these designers think of shite like this!!!
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tusses
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Re: CNC Drawing Help!!!

Postby tusses » Wed May 27, 2015 5:41 pm

Is it a concrete tile with an oak top ? the dwg isn't quite clear ! ?
rubbish dwg TBH ! lol unless they have filled the details with tele'con ?

you just making the top ?

if so, the outline is easy

the chamfer could be jigged with a wedge bed and a wide belt sander or thicknesser etc.

and lastly .. aspire would be better than v-carve pro for "3d" jobs on the cnc .. I thought you had aspire with your 1st machine ?

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Re: CNC Drawing Help!!!

Postby sainty » Wed May 27, 2015 6:20 pm

That's awkward!

Solid stock or panels?

First thoughts are to rip lengths of stock at about 200 wide and machine the chamfer on the long edge - tilting spindle? thicknesser cradle.

Then cut the profile/fixing hole on the cnc with tabs, using the extra width for fixing the rips to the bed - a few screws either side depending on you vac bed.

The only way I can think of doing the final chamfer on the cnc is to run out some laths to the height that you need to raise one end by, fix that to the bed and jig up some clamps to hold the pieces and do an area clear on the raised part, then turn it around and do the other end, by my calculations you'd get 98 on a 8x4 bed at a time and it would probably take about 10-20mins to machine each end depending on cutter width/overlap. As the CNC moves up the bed you could be turning them/loading new blanks so downtime between programs wouldn't be too bad, just take a bit of setting up though.

I hope your charging enough! (£3/£4 each in 22mm MR MDF I reckon, more if they are on a deadline!!!!)

Let us know how you do it.

mark270981
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Re: CNC Drawing Help!!!

Postby mark270981 » Wed May 27, 2015 7:27 pm

Hi All

Yep just a little bit awkward.

Just to add a little clarity.

They are made out of Solid Oak, they were originally cast concrete as the drawing stipulates.

I think the best way to do this is by forming a jig they will rout perhaps ten at a time using a normal hand router.

There is about 200metres of 150 x 20mm wide oak which can we run off with the 8degree chamfer thats required. once cut to 200mm long then the short chamfers can be done in line up.

The radius can be drawn and sanded with a disk sander as close as possible!!

They don't have to be millimetre perfect, but as close as possible.

Any volunteers??
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Mark - Sutton Coldfield

Sheik Maboutie
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Re: CNC Drawing Help!!!

Postby Sheik Maboutie » Wed May 27, 2015 7:40 pm

Mark,

I think you will have a problem trying to maintain a constant thickness to the edge of the piece and have sharp intersections to
the prism.
Attachments
2015.05.27_20h02m08s_001_.png
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mark270981
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Re: CNC Drawing Help!!!

Postby mark270981 » Thu May 28, 2015 9:59 am

Right then.

Up date, with perhaps a disjointed wip.

I decided the best way to do this was to make a jig for the Old CNC, which seems extremely primitive compared to the new one!!

We worked out all the angles on CAD.

Image

Then made a jig

Image

Image

Image

Then rounded the corners off.

Image

We are going to buy in 200 x 150mm blanks with 2no chamfers to long edges.

Then we will remake the jig and improve it so it will hold 16 pieces at a time, with some sort of toggle clamp system and will use a 35mm cutter, so will be done in essentially 2 passes to each side!!

Apologies for the crap report but you get the gist of it?
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Mark - Sutton Coldfield

mark270981
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Re: CNC Drawing Help!!!

Postby mark270981 » Thu May 28, 2015 11:52 am

Hey shake my booty

Thanks for taking your time to draw that up, looks great.

I think it turned out ok in the end - whether we make money off it is yet to be seen?
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