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Messages - magicniner

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231
General Mach Discussion / MPGs . . . Questions, Questions
« on: October 08, 2013, 02:30:34 PM »
I have searched and failed to find answers so I'm throwing myself on the mercy of the fine folks on this forum.

I'd like to add either an MPG pendant controller or individual MPG encoders on each axis.
The second option has significant attraction but to be honest I'd settle for anything that gives me a wheel and variable speed rather than a button with the selected jog speed.
If an encoder for each axis is a realistic option that would be fantastic as it would make CNC conversion of my Emco FB-2 based manual benchtop mill a practical project providing me with a comparatively huge envelope for CNC whilst maintaining manual capability and feel,
Any recommendations gratefully received,
Regards,
Nick

232
Hood,
Just a quick, but big, Thanks!
With your assistance and some help from Al and the guys at BobCad/Cam I completed the project, learned a big chunk about CAM and got my heat treatment furnace door mounted.



The brackets are a little rough-and-ready as cosmetics aren't an issue, but the hole spacing is spot-on and function is perfect,
Regards,
Nick

233
Show"N"Tell ( Your Machines) / Re: My Benchtop Mill
« on: October 08, 2013, 01:57:37 PM »
Having cut my teeth (no pun intended!) on CNC engraving it was only when I tried some conventional metal cutting that I found the limitations of the 1/5 hp motor and Inverter/VFD I'd fitted to get the mill.
Last week I scored a 1 hp Inverter/VFD on ebay for a good price, the same Siemens 420 model series as the one I'd had on the shelf for the smaller motor so I had the manual and some experience. A visit to my local motor supplier and I had all I needed.

Here's the mill sporting it's new motor,



Actually it turned out that I had a little more than I needed - see how close the motor housing is to the column? - the Z-Axis stepper mounting plate on the top of the column had to be profiled to clear the back of the motor, one cooling fin had to be cut off the motor to clear the stepper itself and a little tin work was required on the cooling fan shroud, also to clear the stepper.

The difference is amazing, I now have to consider whether the machine is rigid enough for the cut rather than whether the motor will handle it.
This is my first (a bit rough) project, the shiny bottom door links on the furnace -



The only really critical bit is the hole spacing which, with it being CNC cut, is predictably spot-on.
I was very pleased when the helical pocketing cut to rough the hole as it looked just like the videos with a fountain of fine ally chips, I'll need some chip guards now! :)
Regards,
 - Nick

234
That has come out great, what the hell does your friend do that he has a Logo like that ;D

Hood

Thanks Hood, I was very pleasantly surprised at the fine detail when I zoomed into the photo.
Graham manufactures and sells traditional gentlemen's shaving equipment, the brand for his in-house products is Hellrazors and he wanted to mark the Sheffield Steel brackets while they were still hot from the furnace,
Regards,
Nick

235
Ok no probs, I have just made a short video showing the open pocket and uploading to Youtube but sounds like you know what you are doing now :)
Will still upload anyway as it might help others.
I have not done anything except the open pocket, so no profiles or anything, just showing steps needed for that part :)
Hood

The helping hand is much appreciated, I'll still have a look, I'm new to all this and I know I've a lot to learn ;-)
ATB,
Nick

236
So what I have shown is not what you are wanting?
Hood

Hood,
It looks really good and has helped immensely in pointing me in the right direction, I'm playing with BC and open pocketing right now.
I have stock the right width and thickness and plan on machining the top surface and one end, then flipping the part in the vice to complete the other surface and end,
Regards & Thanks,
Nick

237
See if this is the kind of thing you are wanting to do. I did not select feeds and speeds correctly, just did things quickly.
http://youtu.be/Intky5WCJb8
Hood

Many Thanks Hood!
That looks good, I've just had similar things from Al DePoalo at BC and Mike on the BC support forum and I'm just about there,
Regards,
Nick

238
I've had some great support from BobCadCam and have been informed that this has to be treated as a 3D toolpath, so a feature supporting a boundary must be used, and a boundary drawn, effectively defining a section of the job entirely independently of the model,
Thanks to Al and Mike,
ATB,
Nick

239
Update - Equidistant Offset also takes off some of the circular projection, not as much as the other functions though :-)
I've tried adding a boundary and selecting it but it's ignoring the defined boundary :-(

240
G-Code, CAD, and CAM discussions / A Simple BobCad V25 Job, or So I Thought!
« on: September 30, 2013, 07:19:35 AM »
I need to make a set of four of these hinge links for my heat treatment furnace -



and decided that rather than manually machining them it would be an ideal job with which to learn a little more of my way around V25 BobCad/Cam (Build 996).
I only made the model with one complete end as I'd be flipping the parts to machine the second side.
The model was constructed from a 90mm x 19mm x 3mm "Cube" with 19mm cylinders subtracted from the ends then a 19mm x 3mm cylinder added at one end and a 19mm x 6.2mm cylinder at the other end to give the projecting feature.
I'd started out by simply adding two cylinders to a cube and then in desperation when nothing seemed to be working resorted to first removing cylindrical sections from the "Cube" (in case there was some unseen complexity with hidden leftovers from the cube messing up the path generation) then adding the cylinders back in.

Pocketing the hole was a breeze, so was profiling the outside of the circular projection, then the wheels came off my cart!
Try as I might I couldn't get any of the available features to to generate a tool path to machine all of the large flat area without either missing some in the centre or ploughing through the projection, all with or without adding boundaries where possible.
Some features created paths inside the circle when the flat surface was selected to machine and the circle was selected as a boundary, where options were available it was possible to get them to flip to the outside but that just replicated the Profile feature and didn't address the flat surface.

I worked my way through all the 3-Axis features that offered a possibility of doing the job and was almost ready to give up and spit the dummy when I tried "Equidistant Offset". It works -



With the same model geometry Equidistant Offset works where all the other features fail, it doesn't need a boundary setting as it recognises the shape of the flat surface and deals with it, I feel sure there should be a feature available to 3-Axis Standard users which is capable of the job, but I can't fid it.  

Does anyone have an idea how this could be done by someone with 3-Axis Standard? It's only by chance that I ended up buying 3-Axis Pro and I feel sure this kind of job must be possible with the basic software and that I must have missed something somewhere,
Regards,
Nick


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