Root-4-CNC
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RootCNC
38mm steel tube for US market
In the US market 38mm square steel tube is standard. Is it possible to reduce the dimensions of the steel tube mounting points from 40x40mm to 38x38mm (by only moving each wall in by 1 mm) without altering the other mounting points for the carriages and ball screws? If so, a second set of STL files sized for mounting the Y and X rails would expand the reach of this project without significantly reworking the design.
As I'm looking at this, decreasing to 38mm square tube will reduce the distance between the two halves of the carriage. By my calculation the distance decreases by 2.83mm. This changes the placement of half of the carriage mounting holes on the side panels and the Z axis wood panels. In theory, the upper or lower line of those carriage mounting holes could be changed to slots to accommodate for the two different widths of the carriages. Not sure how people would feel about that. It could make things a tiny bit less stiff. The other way to do it would be to change the mounting hole positions for the XY carriages and have s separate STL file for those pieces to be used by the 38mm people.
I think my preference would be to keep the side and front/ rear panels the same between the two configuration and have the 3D printed parts change in size. This should be easy to configure in the software.
The updates files can be tracked here - https://github.com/RootCNC/Root-4-CNC/tree/38mm-Dev
Here are the files I expect to be impacted by the change:
- [x] X_Axis_Mount_FF
- [x] X_Axis_Mount_FK
- [x] Y_Axis_Mount_FF12
- [x] Y_Axis_Mount_FK12
- [x] XY_Carriage_Coach
- [x] XY_Carriage
Please note - I have no plans of testing these parts, I will require some sort of feedback from the community :)
The files will be in the 38mm-Dev branch of the project until I have feedback on the parts.
Thank you. I have a friend also starting a root 4. I'm sharing this with him. One of both of us should be able to test.
From: Pete [email protected] Sent: Sunday, November 15, 2020 5:02 PM To: RootCNC/Root-4-CNC [email protected] Cc: colemanomartin [email protected]; Author [email protected] Subject: Re: [RootCNC/Root-4-CNC] 38mm steel tube for US market (#2)
Here are the files I expect to be impacted by the change:
- X_Axis_Mount_FF
- X_Axis_Mount_FK
- Y_Axis_Mount_FF12
- Y_Axis_Mount_FK12
- XY_Carriage_Coach
- XY_Carriage
Please note - I have no plans of testing these parts, I will require some sort of feedback from the community :)
The files will be in the 38mm-Dev branch of the project until I have feedback on the parts.
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Please see the update - please can you give me feedback on these parts? once I know they work i'll move the out of the DEV folder
I will get them printed soon. Been printing the other parts. I will let you know how they work. The first two parts you made the changes to worked on the 1-1/2" x 1-1/2" tube I plan to use. Thanks for get these parts made. I was watch a video on making changes to STL in Autodesk Inventor and going to give it a try this week.
Printed the y-axis mounts and they are too tight to use. My stock is exactly 1.5"m(38.1mm) but the part is a bit under. Could be shrinkage? Printed metric versions and they fit fine, I may add a tape sleeve to perfect the fit but its fine as is.
Black PETG. I may be heading in the wrong direction, but I'm printing and using the std 40mm parts with 38.1 tube and its all fitting together fine. My biggest worry was the carriage sets fitting on the side plates and still being adjustable but it was perfect. Same for Z panels, fit is great. There is some play in the y axis mounts, but I plan to use the hold down bolts to make the fine adjustments. Time will tell.
Everything is lining up perfectly. The tubes are galvanized. They don't mic oversized (on my cheap mic) but that might explain things. Sent from my iPhone
On Jan 24, 2021, at 3:50 PM, Pete [email protected] wrote:
It might seem your printer isnt printing to scale perfectly?
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Actually I did use the 38.1 versions of the carriage. Sorry for the confusion. I ground off all the galvanize on a scrap piece and it was still too tight.
I am using 1.5 inch square aluminum tubing. Printed off X_Axis_Mount_FK_38.1mm and it's quite tight, but fits. I used a file to clean up the edges of the tubing and wiggled the printed off piece on most of the way by hand. I believe a small rubber mallet will do nicely for the final bit (See pic below).
I will print the Y_Axis_Mount_FF12_38mm this weekend. My printer claims it will take 24hrs to print and the 3D printer is in my home office. I prefer not to have it running during work hours when I might have meetings.
I rubber mallet is expected from my experiences - it ensures it has a nice tight fit.
I must admit - I don't like leaving my printer on un attended, just because I don't trust it too well.
maybe I need to revisit the sizing for these parts and double check - how much material did you remove??
The aluminum square tubing was just a bit rough from cutting. I ran a flat file along the edges and corners a couple times just to deburr. It's a nice snug fit, snug enough you have to have it lined up square to get it to slide in.
I am not sure I would change the measurement any. I've had other things come up, so I won't be able to print the other parts as planned until next weekend, maybe longer. I will come back and update when I have them printed.
