I played around with these washers today. Since my spring’s inside diameter is a little over 3mm more than the M8 rod, I made a version for the spring to rest in the washer by making a donut cutout in the top of the washer. I don’t know if that is really needed, but it does make the spring stay symmetrically around the M8 rod. Here is a ph…[Read more]
Did I already mention that somewhere?
You probably did. I read thru this thread a while back, but was not considering some things until running into them recently. I probably should read thru this thread again now that I understand it better.
Seeing it on the carpet, and 3D printed really makes it cooler.
I could overlay a different background o…[Read more]
Here is my 1st assembly of the parts. I am using the metal bushings. I will test fit it on the machine tomorrow, but should fit as I test fit the main parts before. I see a couple of things I still want to change, but feels pretty sturdy. I do not have any tension on the spring and the plastic coupling is resting on the top bushing. I real…[Read more]
You were lots of help. Some of it is just going to have to be trial & error. I did notice something I did not expect with the purchased drylin Igus bearings. With the tighten gap I left in the middle bushings tightened a little too much for a smooth movement of the rod, but the side ones work good. The difference was in orientation of that slo…[Read more]
I found this 9/16″(14.3mm) x 1″(25.4mm)x .054″(1.4mm) at my local Ace Hardware store and planning to compress it to about 22mm. How does that sound? I would have liked to find a shorter spring, but that was the closest match I could find.
My center M8 shaft is currently at 120mm & the side M8 shafts should be…[Read more]
I am going to look at getting a spring tomorrow. Can you give a good estimate in how much z travel to expect with the spring? You mentioned earlier that it was not much. I might have to lengthen my rod a few mm’s to clear the bottom of quick release. I would just like to have a better idea of what it would be, so I can avoid a clearance pro…[Read more]
I have all my plastic parts printed out now & test fit the mount in the quick release & looks like it should work. I will have to wait for a warm day before trying it on my MPCNC in the shed. It is snowing here today. I still have to get a spring & cut the rod.
A couple of questions occurred to me yesterday & maybe you mentioned this so…[Read more]
I am constantly amazed at what can be done in openscad. Most of my parts came in on Saturday, so I will test print some parts for fit today with the bearings. I am planning to use 4 of the drylin Igus bearings, 2 on the main shaft & one each on side M8 rods and a 608ZZ skate bearing on the bottom end of the side shafts.
Replaced Olfa blade holder with MPCNC_TN_OlfaBladeHolder_Rev73.scad to add recessed M3 nut traps for cover. Also added a version for mini utility blades MPCNC_TN_MiniUtilityBladeHolder_Rev14.scad. I kind of like these mini utility blades, but least expensive place seems to be harborfreight in packs of 10. The long side of the blade measurers 28…[Read more]
I picked up a box of 200 Husky heavy duty utility knife blades from Home Depot for $10 & a box of 10 mini utility blades for $1.59 at harbor freight. The heavy duty blades measure .65mm thick which is about .05mm thicker than the Stanley blades I have & it does fit into this blade holder mount. The notch side measures 1.6mm longer than the St…[Read more]
The one I made for a mastergrip rotary tool looks like it might be similar enough to that. The mount was for the original MPCNC, but might give you a good starting point if you can not find the exact one you are looking for.
I added MPCNC_TN_OlfaBladeHolder_Rev72.scad and an image showing dimensions for variables to https://www.thingiverse.com/thing:2661474
Here is a copy of the dimension image. The main dimensions you probably need to change are:
Sounds good & look forward to seeing photos. It may not be until January before I get my version put together.
If you meant another screw thru the cover like I showed with the M5 screw hole on top, I made that an option. Here is another idea with the 60 blade angled 30 degrees so it is a 60 angle cut. Could also change that to whatever angle…[Read more]
Is this what you had in mind? Looks like I have enough room to do that without changing the cover. Could also stagger the 2 screws, so the screws do not line up as shown in the other image.
What are the width of those blades, 9mm? The one’s I am using are 7.21mm & I add .2mm for clearance. I was thinking of using set screws along the side also, but dismissed that idea thinking that was not enough support. I then realized that might actually be a better idea & looks a lot better. The nut & screw are sandwiched between the cov…[Read more]
How about something like this? I have adjustments for the blade size and a few other dimensions. I have it set to use an M5 screw & Jam Nut as it seemed like a good size to use. A lock nut or regular nut will increase the height more. I have the shallow cut blade shown, but could use the steeper cut blade also. I show 2 views of it in one…[Read more]
I took some dimensions off the cutoff blades I have, but not sure they are the olfa blades. I attached an image to show those dimensions and different angles of cut height depending on the mounting orientation of the blade. A limitation I see with those blades is depth of cut. At 40 degree cut which is close to what the other blade is there is…[Read more]
That is an interesting design. I had not seen that before. I do not have any software that will open the file types he is using. Like you said the challenge would be to hold those blades in place since there are no holes. You might be able to use a screw on the top with a captive nut and the screw would press against the blade to hold it in…[Read more]
Glad it is working for you & I have had to print very little to test it so far. While walking thru some hobby stores today, I had the idea that an x-acto knife might work with this, but not sure if it would be as strong a blade cut as what you are using. I did 2 design versions, one with the knife and one with just the blade. Using just the bl…[Read more]
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