5 minute cad

Can someone give me the intersection of the angle in the attached drawing. I don’t have access to a cad package until I can install one on my PC

The poor chap has been trying to do this job all day.

i don’t have cad at the moment.

Would want to know the radius of the internal fillet and the width of the straight part.

Get some CAM on you machine at the same time and let the 'puter work out the path rather than write code

Got the rest drawn up just waiting for that info then I'll let you know but will be turning off soon so you may need to wait until morning

Fillet is 1/2 inch

Straight part is 1 inch wide.

The black profile line is the 1/2 inch cutter offset.

He tried to do it without using cutter compensation.

Thanks Jasonb

I have Fusion 360 but I need to add it to the laptop but just don’t have time at the moment.

Down for next week.

Then I can play with the Proxxon cnc mill. And the Unimat 3, and the other unimat 3 and the Unimat 3 milling attachment needs to go onto ebay together with the second unimat 3 to pay for another Proxxon cnc milling which in turn will go on Ebay. I will sell the unimat 3 and milling attachment and some accessories separately. Buy a package, split it up and double your money.

That's a nice round number for the angles, 30deg so your angle between the two black lines is the complementry 60deg

Edited By JasonB on 27/09/2023 22:37:45

Thank you Jason, I will pass it on to him. Lets hope he can do a bit of trig. He is doing this on a Pro Track cnc. Not sure if Pro Track does polar,? I used a Pro Track for about 2 years but that was 25 years ago.

I don't know if this might help, I thought you wanted the coordinates of the small arc, but Jason seems to have done the angles. I couldn't work out where the zero point is, so I guessed and used the centre of the large arcs.

Martin.

Thank you Martin, I will pass it on.

I can easily sort out the intersections from Jason’s drawing but Unfortunately don’t have the time.

Just a Zeus book exercise but I don’t have the time, a Zeus book or a pen and paper at rhe moment which is why I asked on here.

To me its not the best way to go about it using a 1" dia cutter into a 1/2" radius internal fillet will give a large engagement angle that is bound to chatter or deflect if the machine is a bit worn.

Better to use say a 1/2" or 10mm cutter to cut the profile leaveing say 0.2mm and then do a full depth finishing pass. would also allow the notch at the end to be partly machined.

You could download and use Estlcam for free, it has a nag page with a duration that goes up by about 1 second per part you produce a program for if you use it as shareware but for a few parts it is a minor inconvenience. It will allow you to import a DXF and produce the tool path for any size cutter. As Jason says, a smaller cutter than the internal radius would be a better option.

Martin C

Hi Jason, yes,he kbows a saller cuter would be better but he could not program the profile using offsets so he tried tool path size programming which he could not get to work either.

I hope you don’t mind be calling you Jason, seems more convenient than adding a B.

If you do mind, just tell me.

i

I saw the original post on FB, this guy needs some serious training.

Tony

I thought that may be why he needed the angle so he can tell the cutter to move through 60deg of a 0.25" radius if using a 1/2" cutter

Jason is fine

What FB Group Tony? Sounds like there may be some good tool crash pictures coming

Yes,sounds like he does this for a living.

No skills whatsoever. All day attempting to do this. With an old version of a 2d cad package, 5 minutes to draw it and 10 mins max to program it and on to the next job.

I would like him to try some of the stuff I have done by hand, 7,000 + long lines in heidenhein.program tuns for about 7 hours. I think it was for an F116 front landing strut. Not sure on the exact plane but it was 6 protypes for a US fighter aircraft or bomber.

Jason, thank you.

Don't quite know if its a solid block or sheet, but this is F360 cutting it from 5mm sheet. Few tabs to hold it in place and a ramping contour that is constantly lowering the cutter into the work as it goes around. Also included the Post Processor to show how quickly it generates the code.

Tool crashes, I have seen some good ones. Spindle into table, £30,000 damage to ceramic spindle bearings.

I never did this, the odd minor problem, I broke a drill on my first day programing but I only had the manual to show me what to do.

I did blow up a £10,000 4th axis once and took out both x and y axis boards on a week old interact 800 macining centre.

It was a new 4th axis and the chuck key was too long to fit in the front of the chuck. So as it was new, I put the chuck key in the back rather than cutting it down, tightened up the chuck, someone asked me something and I turned around and answered him, turned back, closed the doors and pressed go. Bloody great bang. Luckily the boss claimed back on the company insurance policy. Oh well, **** happens but very rarely it happened to me.

Edited By JasonB on 28/09/2023 09:57:37

Hobby Machinist Projects is the FB page.

Tony