Does anyone have a CAD Dimensioned Drawing or image markup of the current version of the sled
What I am trying to find is the diameter of the Sled and the location and dimensions for the
Mounting points for the Base version (quadrilateral Kinematics) as well as mounting locations for the Current
Version of the Linkage Kit from Logan.
This will allow others should they want to get their part created externally if required and allow for experimentation with materials.
Also is there any science behind the current diameter of the sled (why was it picked to be the size it is?)
Does anyone have a CAD Dimensioned Drawing or image markup of the current version of the sled
there are several floating around. I believe logan has one in the “linkage kit
now available” topic. If you search onshape, you can find a few versions of the
sled.
There was someone a few days ago trying to make a version that had all the holes
for all the linkage kits.
What I am trying to find is the diameter of the Sled and the location and dimensions for the
Mounting points for the Base version (quadrilateral Kinematics) as well as mounting locations for the Current
Version of the Linkage Kit from Logan.
the sled is 18" diameter, there’s no special science behind that, it’s a “that
works and holds everything” size
As far as sled size. I would not go under 18 especially if you plan to use the linkage setup. I ran into an issue with too small of a sled with mine. The linkages add a center of gravity variable that can be a pain if sled is too small. When the linkages are used you have a sliding cg in the z direction. I was having a leaning out problem, which can be helped by aiming for the cg in z direction. Also it has been pointed out that leaning out vs leaning in is a result of having the chains connected too far from sled or too close. The saving grace on this is to have a sled that is big enough to cause force to help keep it solidly against your workpiece. I am switching out the motors now and may wind up having to make a new sled because of these issues. This time will be using the results of my testing with a linkage system I built and the knowledge gained from this awsome group of people involved in this project.
Thanks to all that have contributed.
Thuber
Thanks for that Thuber. I gathered as much as I am Modelling my Sled in Sketchup and could see what you are referring to with the potential link interference. This is why it would be worth while having the dimensions published for those who choose to make the sled first while they wait for their kit to arrive.
Once I have my model complete I will publish the CAD dimensions and the 3D model noting that I found an excellent 2D markup in the forums thanks to Bee and Dlang.
I’ve got one more variant for you (assuming I can get someone to cut things),
take the original top pantograph kit, make one hole 3/4" down from the top bolt,
and a second 1.5" down from that hole
MeticulousMaynard,
This is excellent. What we still need is a 2D markup with dimensions as each of the routers have different base diameters (Fix base or Plunge Base) . Also there is no detail of the standoff heigh for the linkage kits. What is needed is at least one Markup for each Linkage type along with standoff heights. People can then choose which markup to use / test / validate.
This will allow new Maslow users to quickly identify if there will be any interference with their Fixed or Plunge Base.
That is some beautiful nesting! I remember seeing the update to the thread, but I hadn’t taken the time yet to update the Fusion model with your new parts. We’ll be pretty well snowed in tomorrow so I’m thinking I could probably do it then.
I’m really starting to miss that waterjet cutter at my last job. I could always throw the operator some beer or cash for a couple of parts. I’m sure he would have been more than happy to do the occasional run of parts for us.
I made these 2D drawings from that model (dimensions somehow ended up in CM even though I drew it in MM):
These drawings include the mounting holes specifically for the Rigid router base, so anyone using another type of router can ignore those. This does give the locations of the linkage mounting holes, based on templates from David and Logan. They don’t detail much about the standoffs. We probably want to standardize this to make it easier for new people coming into this, so we probably should make it something they could easily purchase or machine with the Maslow. The standoff height itself is largely dependent on your machine. I don’t have good data on what that should be for a stock frame. I have a custom frame so what I’ve For mine, it’s about 38mm (1.5in).
Big side note, I rounded the sled diameter off to an even 500mm (19.685in). Part of the reason I did this was to give me a wider base for the top mount linkage. That way, I can accurately locate the top hole of the linkage without needing additional parts. The other was to make a larger base for my improved Z-axis, but more on that later.
MeticulousMaynard,
Thanks for that this is excellent. The lower markup was the image I was working off. I have been working on the mounting arrangement for the Bosch 1600CE Fixed Base as that is what I currently have.
We should base the standoff height from the stock frame for starters then if better frame designs evolve people can publish their preferred standoff height to keep the chains parallel with the workpiece plane.
PS I loved your render of the sled with the linkages - I can guarantee mine will not look as good lol
They don’t detail much about the standoffs. We probably want to
standardize this to make it easier for new people coming into this, so we
probably should make it something they could easily purchase or machine with
the Maslow. The standoff height itself is largely dependent on your machine. I
don’t have good data on what that should be for a stock frame. I have a custom
frame so what I’ve For mine, it’s about 38mm (1.5in).
Initially I was basing the standoff on a 2x3 or 2x4 on edge, and with the latest
version, it can either be layers of plywood, or a 2x4 on edge. Since one of the
arms goes under the center bar that’s mounted to the standoff, it’s got angles
cut in it. Currently I’m showing the angle going all the way down to the width
of the center bar (1/2") to make lining things up easy, but as long as it’s 1/2"
or so below the bottom hole, the rest doesn’t matter (so minimum length ~2")
I’m very surprised that you are only 38mm up from the sled, everyone else I’ve
seen has been talking roughly twice that.
Big side note, I rounded the sled diameter off to an even 500mm (19.685in).
it’s all a matter of which system you are being round in
Part of the reason I did this was to give me a wider base for the top mount
linkage. That way, I can accurately locate the top hole of the linkage without
needing additional parts.
I didn’t really worry about that because the 2x4 could be anchored in the middle
(and or glued down)
David,
I am using the linkage kit that has mountings equidistant (4 quadrants) at 4.5 inch radius (9 inch diameter). I now have some measurements for the Bosch GKfF1600 CE Fixed base PVC mounting plate which will be fixed to the sled and that the fixed base attaches to.
I could not find any dimensioned drawings for the PVC base for the Bosch so used the 2 chord method to determine the centre of the circles after tracing then checked each leg of the corresponding isosceles triangles for each chord to confirm the outer and inner radius of the circles and they matched up so can confirm the radius with reasonable level of accuracy at the present time. Good Enough for modelling and a 2D drawing.
The PVC mounting plate has an outside radius of 77mm and an inside radius (hole cutout) of 25mm.
Just checking my model to ensure there will be no interference with the above mentioned linkage kit from Logan.
The 2D dimensioned drawings should include the largest Diameter circle that does not interfere with the standoff and linkage kit then everyone can easily determine if their router base is suitable for use with the linkage variants or not.
Method used is shown below - It is useful for new users making their sleds with limited tools and measuring devices, just need a ruler to determine centre of circle and confirm radius. Excuse the hand writing but I am a lefty.
@Dlang The model I linked above has been updated with the new version of the linkage system.
Sorry, I forgot about your system with the 2x4’s. In the model I posted, I’m just using plywood rings as standoffs so they can be made on the machine. I have a very low motor plane so my chain height is really close to the bed. I’ve been thinking about mounting my motors to the front of the brackets like mrfugu did, which will give me a little more height.
@stuartri I think that was the router I was considering using when I first was planning out the machine. It looks pretty solid, and the height adjustment system should adapt well to the Z-Axis kit.
The instructions for the Rigid say to remove the plastic skid plate from the router base and screw the sled into the skid plate mounting holes. Does the Bosch you’re using have 3 mounting holes in the fixed base? It looks like they may be similar to the rigid’s based on the PVC base picture you posted. That might simplify your hole pattern.
@Dlang The model I linked above has been updated with the new version of the linkage system.
Sorry, I forgot about your system with the 2x4’s. In the model I posted, I’m
just using plywood rings as standoffs so they can be made on the machine. I
have a very low motor plane so my chain height is really close to the bed.
I’ve been thinking about mounting my motors to the front of the brackets like
mrfugu did, which will give me a little more height.
move the entire top beam out. It’s pretty important to have the sled reasonably
balanced (so if you support it by the chains it’s not tipping forward or back)
@stuartri I think that was the router I was considering using when I first was
planning out the machine. It looks pretty solid, and the height adjustment
system should adapt well to the Z-Axis kit.
The instructions for the Rigid say to remove the plastic skid plate from the
router base and screw the sled into the skid plate mounting holes. Does the
Bosch you’re using have 3 mounting holes in the fixed base? It looks like they
may be similar to the rigid’s based on the PVC base picture you posted. That
might simplify your hole pattern.
pretty much every router has a similar 3-hole mounting, but the holes are in
different orientations and distances from the bit (just about all of them are a
triangle with the bit at the center)
)
