Show all posts by user
People building or using RepRaps.
Re: Can't shell an object in solidworks - 10 years ago
I learned most of my surfacing (which really isn;t nearly expert level) from presentations by Ed Eaton at the DiMonte Group (engineering consultants). Ed has always made his presentation materials for SolidWorks World (user convention) available. You can get them all here. He even has a presentation specifically about shelling, which I haven't seen yet. Anyhow, the materials are complete enough tby Dale Dunn - 3D Design tools
Re: Can't shell an object in solidworks - 10 years ago
SolidWorks user here, late to the party. If you have .igs and .x_b files, you have a proper BREP solid model. Whoever did your scanning had an expensive piece of software make the solids from the scan data. It is very unlikely that you'll get it to shell in one feature. There will be small faces that SW doesn't know to delete, and small radii that need to disappear, that sort of thing. Use the mby Dale Dunn - 3D Design tools
Re: Tool change like HP pen plotter - 10 years ago
Follow the link in my previous post for models files.by Dale Dunn - Mechanics
Re: BOLTS, a standard parts library for OpenSCAD and FreeCAD - 10 years ago
Well, If the net effect is that the project as a whole was improved, then it was worth the time. Hopefully I can come back to it in the future, as you say. I do think the project is worthwhile.by Dale Dunn - 3D Design tools
Re: BOLTS, a standard parts library for OpenSCAD and FreeCAD - 10 years ago
That question is feeling complicated. It has been almost 3 months since I last put time into this. I think it is very worthwhile to have a FOSS library for various platforms. What I am finding is that I don't have enough time to devote to this to keep in my mind how it works. If I look at my to-do list, it contains things like "figure out .base files." I feel bad about that, because I feel like yby Dale Dunn - 3D Design tools
Re: Upgrading belts - 10 years ago
The same number of teeth but smaller will need new calibration. Just work out the math for how many steps per mm of travel there should be with the new pulleys, and the software side is just a matter of replacing the right number with the new one, compile and upload. You can get through it. Anyhow, breaking things is just another way to learn right?by Dale Dunn - Reprappers
Estimating stepper torque - 10 years ago
Forgive my ignorance please, but I need to estimate the maximum torque some steppers I have will exert in the system so I can size related components. I have the rated current, voltage and holding torque. Does the torque roughly scale with electrical power applied? Or do I need to put in the time to comprehend steppers? I did some Googling to see if I could work it out, but the topic is larger thby Dale Dunn - Stepper Motors, Servo Motors, DC Motors
Re: Automatic Tool Changer - 10 years ago
Nice work. I think I'll be trying to incorporate something like this into my Ingentis derivative.by Dale Dunn - Delta Machines
Re: Tool change like HP pen plotter - 10 years ago
Thanks for the kind assessment. But after some discussion of the pros and cons for different machine types on my G+ post (where I also linked to model files), I'm now leaning toward a magnetic kinematic coupling for the printer design I'm working on now. It's encouraging to hear that support for half a dozen tools is coming to the electronics. That half of the design work is outside my skill set.by Dale Dunn - Mechanics
Tool change like HP pen plotter - 10 years ago
Here's a design study of a tool changer based on the old HP pen plotters. They didn't seem to need an extra motion control of any kind to pick or stow a pen on the carousel. I had never had an opportunity to dismantle one to see how they work, so a bit of Googling led me to the HP online museum where a user's manual showed me enough of the mechanism to figure it out. The gist of it is this: Sprinby Dale Dunn - Mechanics
Re: Bad verticals and strings. Ideas? - 10 years ago
I see a lot of missing perimeters. I suspect the extruder is slipping, on the verge of jamming. Maybe try a little higher temperature. Get it looking consistent, then calibrate the extruder again.by Dale Dunn - Printing
Re: What Softwares are you Using? - 10 years ago
SolidWorks here as well, via work.by Dale Dunn - 3D Design tools
Re: QuadRap - 10 years ago
That was a while back. What is your opinion of the diagonal bracing he's used?by Dale Dunn - Reprappers
Re: Variant of Goopyplastic's Tantillus Variantc - 10 years ago
QuoteSniglet It made it over there. (I opened the thread) ... I don't see it on the community page.by Dale Dunn - Tantillus
Re: Suddenly more and more Warts/Zits (alot) on print surface. (ABS) - 10 years ago
Is it stinky? The extruder might be running hot, which causes something like a phase transition in ABS. It smells bad, gets a glossy surface, and can make bubbles. Probably the stink trying to get out.by Dale Dunn - Printing
Re: Open-source 3D printed parts often stronger than proprietary versions - 10 years ago
This seems more a test of the filaments than a test of the printers. I'd like to know which filaments were tested, but I'm not going to sign up with academia.edu to read the paper. I'm looking forward to their layer adhesion testing results, but expect similar. At first, the result seemed like a no-brainer, but there are a couple interesting items: The first interesting thing is that ABS has thby Dale Dunn - General
Re: Simulation software - 10 years ago
What do you need to simulate, and what do you mean by reasonable?by Dale Dunn - 3D Design tools
Re: Z- Axis Designing & Changing the Orientation - 10 years ago
The CoreXY machines don't really have a particular Z axis arrangement associated with them. It really shouldn't have any requirements that are different from other Cartesian motion printers.by Dale Dunn - Mechanics
Re: Brushless Spindle - 10 years ago
Well, it would probably be fun to try. My prediction is very early bearing failure due to high radial loads. Also, they're probably not very rigid, which will cause chatter in a lot of cutting conditions. Now then, using it to power a well-supported spindle shaft might be successful. I'm not sure what to use for a coupling though. A belt drive would create the radial load problem again. Maybe doby Dale Dunn - CNC Routers, Mills, and Hybrid RepRapping
Re: Z- Axis Designing & Changing the Orientation - 10 years ago
If you change the screws, you will need to a new Z steps per mm parameter and change it in the firmware. If you are changing the direction of motion, you will need to invert the motion in the firmware or reverse the wiring on the stepper motor. Both firmware settings are found in configuration.h if you are using Marlin firmware. Download the Arduino development environment and spend some time geby Dale Dunn - Mechanics
Re: Rapid Tool-Head changer (very light multi-extruder) - 10 years ago
Simple coil springs landing on copper pads would probably do it. (With dielectric grease to limit contamination from arcing, or cut power during a change.) But you'll want a PID controller to maintain correct temperature, I think. Otherwise you risk burning something up or waiting several seconds every tool change. Or I guess you could fiddle with a current-controlled supply until you get somethiby Dale Dunn - Developers
Re: Warts on print - 10 years ago
Could be moisture or other contamination in the filament.by Dale Dunn - Printing
Re: New here - just looking for some tips from experienced people! - 10 years ago
1- I don't have one of those, so I don't know for sure. I believe people normally leave them at 100% unless there is a need to slow down or speed up to deal with a difficult portion of a particular print. For example, you may want to slow it down to give small layers more time to cool, or speed it up to keep really small layers from melting. 2- Apart from implementing auto-leveling, it sounds liby Dale Dunn - Printing
Re: Z- Axis Designing & Changing the Orientation - 10 years ago
The Z axis stepper motors' step per mm setting in the firmware is all you need to worry about. Design the mechanism, then you'll be able to work out the new steps/mm based on the number of steps per revolution of your motors and the various ratios of whatever mechanism you come up with. All that assumes a linear mathematical relationship between motor and axis motion, otherwise you'll be gettingby Dale Dunn - Mechanics
Re: Variant of Goopyplastic's Tantillus Variantc - 10 years ago
Yes, I would love to start from your latest version as STEP. Just point me to whichever location is most convenient for you, please. I totally get the overcommitted with limited spare time thing. Thanks in advance.by Dale Dunn - Tantillus
Re: Variant of Goopyplastic's Tantillus Variant - 10 years ago
Tim, I'm getting ready to start design work on my next printer, based on your Ingentis. IIRC, there have been some changes since you published to Youmagine. Is there a more recent repository somewhere? Thanks in advance.by Dale Dunn - Tantillus
Re: Gcode post processors - 10 years ago
Wow, thanks for that. The tool change especially I think I'll be needing sometime in hopefully not too distant future. I'll wait until then to understand how to use it.by Dale Dunn - Experimental
Re: Rapid Tool-Head changer (very light multi-extruder) - 10 years ago
Are you looking at disconnecting the extruder every time it's parked? You'll have to wait on temperature to come back up every time you take it out of the magazine (Once per layer, I hope). I guess that's the price to be paid for not having a separate controller for each extruder?by Dale Dunn - Developers
Re: BOLTS, a standard parts library for OpenSCAD and FreeCAD - 10 years ago
QuotejreinhardtThis is not really a problem because this limitation affects other systems. For example the IGES backend can not use forward slashes in filenames. Are decimal equivalents something that people understand (i.e. 0.375 instead of 3/8), or is this too uncommon? QuotejreinhardtThe imperial system is really quite curious. That's being generous. It's a mess. It's not uncommon for engineby Dale Dunn - 3D Design tools
Re: BOLTS, a standard parts library for OpenSCAD and FreeCAD - 11 years ago
Quotejreinhardt... I have started to add set screws to the hex_socket.blt file in my solidworks branch. I used data from Maybe you can try add the remaining point types and the class for the ANSI standard. I haven't forgotten this. Adding a model and base file for the hex screw took the whole afternoon, and I'm out of time for today. Well, the new files and learning some Python string formattinby Dale Dunn - 3D Design tools