No I’m good with your thinking on it. I was just showing what I have seen. You are the engineer here so I trust you.
Man are we really getting 1hp out of these steppers??? That’s just crazy to think. Never had it put in a number I can understand LOL. Are we sticking with not real gates belts or are you thinking about getting the real ones? Or am I just misunderstanding due it it being hard to find info on Gates
When we say aiming for 120mm/s are we thinking that as normal print speed with travel and infill being faster? If not then I think 120mm/s is on the low end. Would be nice to see the 2-300 mm/s range if that’s possible without to many other tradeoffs
If you can find some they will work, just be sure to get matching pulleys. I literally tried again 2 weeks ago (I try once a year) to buy some in bulk and they replied “You need to buy an awful lot of them for it to make sense. You are better off buying from a local distributor.” That has always been their reply. I explain who I am, how much I use in a year and they blow me off every time. If I call a local distributor, they do the same thing. I pushed one time and I am pretty sure he quoted me $7/foot in bulk. If they do not want to sell them to me after 6 years or so of trying I am done trying. Until next year when I forget the reply they always give.
Cheers for the info, trying to confirm my understanding…
Wider belts are stiffer and need more tension to stay engaged at faster speeds? I didn’t realize this, and wrongly assumed wider would mean more engaged, lol.
So, is this is why you’re contemplating two 6mm belts paired for XY?
Non gates belts it is! That’s just messed up!
Pick a number you like and have a look at the chart. If you want to go faster, that says thinner belt, but that also means the acceleration forces are much higher, thicker belt. I feel we are dancing on the line with an unknow belt, so which way would you want to round, stronger or faster. My choice was stronger for longevity but it is a guess without some math and actual testing.
I can only guess at the actual forces. But if you have the extruder mass with bearing block and the accelerations and travel speed you can figure out the actual forces. Anything you add to it increases the mass (canbus). F=MA
“Note that your purchase quantities will need to be quite high in order to purchase directly from Gates.”
Seems like yours would fit well into a wholesale amount but I guess they like their belts better than you do LOL. Cant blame you one bit!
I don’t disagree with you at all, like @azab2c I’m trying to learn it here as well. And what you are saying makes total sense. We have guys printing that fast with the 10mm belts so I don’t think the 9mm will slow us down any. Plus if I remember right that keeps you in the size for the bearings and all correct?
Once I get the parts printed for the tool head on my E5+ Ill be able to weigh it all together and give you the numbers if you are interested. I would like to run a similar setup on the next MP3DP
I can’t remember who. I thought @probrwr or @azab2c posted a measurement of theirs?? Maybe between 350-400 grams or something like that?
Ill be curious to see what I end up with this one. Rapido HF hot end and Orbiter V2 with filament sensor and thinking of going CPAP for cooling to keep the fan weight off the head. And klicky for bed probe so when printing that weight wont matter. only other thing is hot end fan, 3030 fan on the orbiter and the ebb. Just need to see what all that weighs with the printed parts as well when its all said and done
edit bad math
I was also off on the rpm, 560 @320mm/s.
Well 6mm will work according to a 3gt chart.
Do you want 6mm or 9mm?
2gt chart, https://docs.rs-online.com/5016/0900766b8002d3b7.pdf
Well at least you were way over instead of under LOL. honestly I’m good with either. So I go back to can we get bearings that will last for the 6mm and will that make belt routing easier for you?
Bad math on the HP lots of conversions.
Caught up(ish)…
Belts: I have 2 Hypercubes that use 6mm belts and flanged bearings. They are smaller units with the biggest being 220^3. I think the bigger belts are the wise choice in the MP3DP. I also prefer the actual smooth and toothed idlers so you don’t have to flip a belt in the back which I expect will not work as well with the larger belt size. Is there a REAL reason to change the size? You are looking at 2mm in space savings height wise. What is the cost difference and availability of 9mm hardware and belts?
Using 6mm on the Z makes some sense if you are changing to POM wheels around the extrusion to remove the rails from the z axis. It would allow you to tuck the belt in and move the steppers a little farther out. It would affect the usable Z space due to clamping requirements but that is an easy fix. Also there have to be 100 ways to clamp the end of a belt in a channel out there.
Fasteners: You can’t get away from the requirement for M3 due to the rails and steppers. I agree with changing to M5 for the rest of the fasteners. Larger fasteners will increase the clamping of parts to the frame. I also used the process of tapping the ends of my extrusions and drilling access holes to build my frame. This method does require a good way to make sure the ends are square to work. All my panels are secured with clips and M5’s in them also.
So now am learning about GT3 and more recent GT4, Gates HQ in Denver, etc…
Worth pitching to Gates Marketing that a lot of your Customers work professionally for a variety of engineering and industrial corporations. Exposure to GT3 and GT4 products through your machines could help create Gates product and quality awareness, indirectly leading to larger sales opportunities for them?
My extruder, fan, bl touch, adapter plate and EBB36 was 280g
The adapter plate is now obsolete and I have not weighed the carriage with the extruder on it.
While I think 6mm is plenty for it I do think sticking with the same size belt all the way around is a good idea from a BOM standpoint. Unless there is another advantage to it that I’m not currently seeing
1.0728 mechanical horsepowers
That puts us at the edge of a gates 5mm belt, so probably similar to a 6mm clone.
Again I think I vote for 9mm for longevity vs ultimate accel.
I agree. I also don’t have an issue with changing it all to 6. I think the advantage is to reduce the cost of the rails on Z. It would also give an unlimited(ish) z height capability.
+1
ugh…why a 4 character minimum?? lol