Ha! Itās okay, I should have tested it again before I committed to the cotter pin idea! I have no excuse!
I mentioned it in the other thread, but they do seem to clear. Note I turned them on their āsideā instead of up and downā¦ that allowed a little more clearance, but I think it would be fine either way.
They are certainly easier to get ahold of
Drawings filesā¦
@pillageTHENburn - Iām not sure if you intended your design to be āopen sourceā or not, so please forgive if this is a bad ask
Wondered if you had the CAD files for your kit available anywhereā¦ Started to work on a sled layout to cut to have a nice, cleanly cut setup instead of my hand-done one and realized I donāt have the exact hole spacing dimensions. I can measure, obviously, but figured it would remove one level of inaccuracy to just work off the original design.
Alternatively, did you have a chance to work on a CAD drawing of the sled with the holes for the linkages marked?
Sorry to ask for more work
Thanks!
Bruce
Andā¦ my stab at it as a learning onshape personā¦
No guaranteesā¦
Note, I included a stab at mounting holes for a R2202 router, which it seems like is closest to āstandardā (itās what I have :-))ā¦
I have NOT cut one of these and tried it yet.
Totally! I usually design in Illustrator so I donāt have actual proper CAD files but I have an .ai file Iād be happy to share. Iām not entirely certain my files would be of any use to someone using a router to cut them out because I laid everything out for a laser specifically but perhaps it would be a starting point?
For the kit Iām using 9" between centers for the hole spacing. The actual measurement doesnāt really matter as long as itās consistent (and clears the router etc.).
I donāt know onshape at all but that sled looks legit! What spacing do you have for the linkage mounts?
I did finally make a drill template with instructions! Download the PDF here!
This is a first attempt so if you try it
[quote=āpillageTHENburn, post:25, topic:704ā]
Totally! I usually design in Illustrator so I donāt have actual proper CAD files but I have an .ai file Iād be happy to share. Iām not entirely certain my files would be of any use to someone using a router to cut them out because I laid everything out for a laser specifically but perhaps it would be a starting point?[/quote]
For myself, I wasnāt looking to cut a set (as I have your great ones :-)), but more to use components āelectronicallyā to help lay out my sled, etc.
I measured my linkage and went with 9"ā¦ seems I was right
Oh! Iām sorry, I misunderstood! Iām glad it worked out!
No worries, all good
The PDF link I posted above was apparently to an āoldā version of the template. It was way more complicated than it needed to be. I thought I had updated the link but apparently I hadnāt. I fixed it now.
Hereās the correct link: Linkage drill template
@pillageTHENburn, Have you posted the appropriate calibration number for the sled kit? Sorry if Iāve overlooked it :
It should be about 269.7mm from the center of the bit to the bit-side face of piece G2 (where the cotter pin in the chain rests). If we are measuring the actual chain then youād have to subtract whatever amount of chain protrudes in past that face on G2. This amount will differ slightly (<~1mm?) depending on if you use the original Maslow cotter pins through the space in the chain; or if you run a pin through the actual chain pin hole.
Thereās also a new auto calibration function which should find it automatically
Mine converged to
So maybe it even works!
Very nice!
Good jobā¦ looking forward to how it works for youā¦
@pillageTHENburn is there a design file I can look at, or something theoretical I can read?
When I search for ātriangular kinematicā or similar I get horribly sidetracked and confused
Any more accuracy tests
Yes! The files I have are .ai files designed specifically for a laser cutter (so they are not typical CAD) but Iād be happy to share them! I added most of the development updates in the thread throwing my hat in the sled modification ring. But I know that thread is prohibitively long so here are some āchapter markersā for you
- This is the original concept and also the reason why many people still call it a pantograph (though technically all current versions are double-crank parallelogram four bar linkage mechanisms. I plan to do a short writeup explaining the simple misconception soon)
- This post sort of explains the different concepts for linkages, this post was made very early on and the diagrams are not to scale at all. But it lists my different original design ideas and most of the criteria that must be met in order to make them function properly. (Iāve since had a few other ideas but havenāt posted them yet).
- This post has some better diagrams of the 45Ė version.
Also @dlang put together a relatively comprehensive overview of the triangular vs quadrilateral kinematics issue here:
Hopefully that helps clear it up a little? Perhaps this is not what you were askingā¦
What is the lead time on your linkage kits you are selling?
Iām a bit behind at the moment because I was waiting on a shipment of specialty hardware (and more wood) but that has since come in and I am filling orders again as fast as I can (I have many hours of late night laser cutting in my future). Most of the people who have ordered them do not yet have a Maslow so it hasnāt been a big problem for them, but I can work with you if you need it sooner. Just let me know and I will see what I can do.
Hi @pillageTHENburn, I just ordered the linkage kit thought I donāt have the Maslow kit or equivalent parts yet.
You mentioned that youād be willing to supply the SVG, .ai or other source design files under a free/libre license. Have you done this already? If so, could you point to where this was made available? If not, would it be possible to put them somewhere (and with the appropriate license) so that we can take a look? Maybe the MaslowCNC Mechanics repo?
Thanks!