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Messages - Woodboss

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Support / Sanding elipses using a fixed tool
« on: September 23, 2018, 10:43:46 PM »
I want to use the robot to sand the periphery of a bunch of elipses which the robot will hold centrally with a gripper, and using a belt sander.

The sander has belt pulley axes that are vertical, so that the belt is vertical and travels horizontally. Photo attached.
The elipses were cut by the robot so I know the dimensions but the path the centre needs to follow to keep the point of contact tangental is not the original elipse (another photo). Also they need to be rotated through 360 degrees as they follow the path so that the point of contact with the belt is always tangental?

Rather more complex a problem than I thought when I started this. I've a feeling that there may be feed speed issues on the long and short radius curves to deal with as well.

Any help here would be much appreciated!

Perhaps I should just make a vertical drum sander - but then I only just made the belt one - and it works really well...

Support / Re: Plasma cutting...
« on: March 18, 2018, 04:50:54 PM »
Can I come?

Support / Plasma cutting...
« on: March 18, 2018, 12:13:36 PM »

I'm running out of plywood, and the spindle is noisy and dusty, and would like to make some big things to go outdoors, so:

I'd be interested to hear how anyone has got on using KPRC with plasma cutting.
Setup, successes, failures, problems etc.

Support / Re: Orient component not getting parts flat for cutting?
« on: March 05, 2018, 07:32:52 PM »
Hi Johannes,

Everything's working great now and I'm really pleased with the definition and the results of my first attempts milling this!
Now I will work on the cutter type, spindle speed, feed speed, etc. can of worms...
Thanks again for your help.

Best regards,

Support / Re: Orient component not getting parts flat for cutting?
« on: March 05, 2018, 12:21:21 PM »
Hi Johannes,
Typical of my muddles! Had a problem, failed to post correctly, thought I fixed the problem, unfixed it, re-posted on the Mcneel forum and a super kind Korean gent fixed it properly! So much to learn with Grasshopper even with my limited aspirations!

I just cut my first messy prototype ring out of ply, very pleased, pic attached.
Only problem left to solve now is to get the tool to retract between cutting the inner and outer rings. I think it's a case of appending one set of planes to the other, but as a separate branch.

Also I would like to step through the program simulation somehow. The slider or 'play' are to fast for me.

Best regards,

Support / Re: Orient component not getting parts flat for cutting?
« on: March 03, 2018, 12:03:15 PM »
Usual thing - two minutes after posting I have fixed it!

Support / Re: Orient component not getting parts flat for cutting?
« on: March 03, 2018, 11:11:07 AM »
Forgot the files!

Support / Orient component not getting parts flat for cutting?
« on: March 03, 2018, 11:06:33 AM »
I've 'oriented' my parts to the XY plane for nesting and cutting - but they're all airborne and slanted in a strange way.
The rectangular grid is flat, but the parts 'oriented' onto it are not...
Thanks in advance for any help.

Support / Re: Pocketing sequence
« on: December 22, 2017, 07:48:23 PM »
Thanks Johannes,

I hadn't realised that 'move' would work for a list like that, I just thought in terms of points, curves etc.

I'm just about set to mangle a lot of lumps of timber trying to make super size Turners Cubes over the holiday now.
One day I'm going to ask a difficult question...


Support / Pocketing sequence
« on: December 22, 2017, 12:52:48 PM »
I have a definition which works nicely for cutting circular pockets, but so far only as deep as one pass will allow.

My next step is to add multiple passes at increasing depths in order to cut deeper pockets.

I'm wondering what the best approach to this will be:
Recycling the existing definition?
Or trying something more fun like Hoopsnake?

Also reverse direction of cut...

Support / Optimising process sequence
« on: December 11, 2017, 10:23:11 AM »
I have a project which includes a large number of discreet cutting or similar operations to perform on pieces of material.
Grasshopper calculates the cutting list and outputs it in a seemingly random sequence which has the robot jumping around all over the place.
Can I sort the list such that the cutting sequence is less random?
Perhaps in ascending X & Y coordinate values of the approach moves?

Support / Re: Making a command list that works...
« on: November 23, 2017, 08:41:52 AM »
Hi Johannes,

Your solution is far more elegant than my attempt. Though obtaining a dodecahedron in one move via Weaverbird does seem a little like cheating!

I'm restarting, and following your suggested workflow.

Thanks again for your help.

Best regards,


Tutorials / Re: Video Tutorial - Hot-Wire Cutter
« on: November 19, 2017, 05:48:00 PM »
Hi Karl,

I just came back to messing with robotics etc after a summer break.
Your HW tutorial was instrumental in my being able to make up a definition for designing and cutting moulds for concrete corner keepers. (I've attached it just because I'm proud of my most complex definition so far!) 
Next thing is to get my tool set up...
Thanks again for your great tutorials, I think I've stolen parts of most of them for various of my efforts.


Support / Re: Making a command list that works...
« on: November 18, 2017, 09:24:17 AM »
Hi Johannes,

Thanks for the quick reply!

I don't have a problem (yet) with the retracts etc. but I have so far been unable to get the cuts - linear moves- into a list format that works. When I make up the list sequence from the start and end points of each of the four cuts for example, the cut lines stop working or turning green when selected, and the command sequence is not what I would expect...

I suspect this is something simple that I'm doing wrong?

My rotary table is a full size Fibro with Esitron plc which came off a demolition site! Only signals available for robot use are DO start, and DI ready. But very versatile programming features for sequences of moves etc.

Best regards,

Support / Making a command list that works...
« on: November 17, 2017, 09:53:52 PM »
I'm trying to cut out a dodecahedron from a block of foam mounted on a rotary table using a hot wire.

Cuts sequence will be: top and one upper side, then the table will rotate 72 degrees for the second upper
cut, etc.

I have defined the dodecahedron and the cut lines are good individually, but I need to get the cuts into a list in the right order and with some DIO and wait for the table. When I try to make a list the cut lines quit working.

Any help would be most appreciated...

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