Nema 23 Questions

TimVukman

GATES PowerGrip GT3 xxx-2MGT3-6

Thanks for the info. I found them on Amazon.ca, but not sure it I have length choices. Getting stuff from the UK takes almost as long as China. I haven't checked the US yet.

Since I changed out the whole hot end, I will need to recalibrate the bowden extruder by the look of the prints. What would be a good hot end? It seems the E3d V6 is touchy to get the flow set up. There are so many choices that it's hard for my level of experience to make a choice.
Thanks

deckingman

@timvukman Personally I'd go for the lite version of the V6 unless you really want to run higher than about 235degC. It has a PTFE liner which goes right through the heat sink and is much less prone to jamming. If you already have a V6, then I think you only need but the heat sink (and some PTFE tubing).

wilriker

@timvukman As it usually is: while researching for where I can buy them in/from Germany at the lowest price I was stumbling across a Canadian shop also. But for the life of me I cannot find it anymore.

TimVukman

Hi wilriker:

I did find the home site for gates belts, and I found a ton of automotive belts. I did see indications that the size I was searching for existed. I did not find it though.

In the meantime, today I switched my X and Y drives back to belts, and each is running on a linear bearing instead of wheels. I found the original belts and though I had to extend them, they are installed and tight enough that there is no skipping.

Currently printing a 20mm cube that looks fantastic. I missed the step of changing the 500mm/sec for the threaded rod down to the 100mm/sec for belts. Very smooth!

I used the extruder bar on the web interface and turned it down to 80%. Not getting the splotches of filament anymore.

Thanks so much for the assistance and suggestions. Very happy. I will find the Gates belts. Gorilla Super Glue works very well for extending belts. Just cut off a section and apply the glue so the teeth of one part mesh to the teeth of the next part. Then glue the last part back on teeth to teeth and leave the backward section inside the V-Slot.

Phaedrux

@wilriker said in Nema 23 Questions:

@timvukman As it usually is: while researching for where I can buy them in/from Germany at the lowest price I was stumbling across a Canadian shop also. But for the life of me I cannot find it anymore.

There's only so many places in Canada to get printer stuff.

spool3D.ca
Makerparts.ca (openbuilds distributer)
Filaments.ca

wilriker

@phaedrux said in Nema 23 Questions:

There's only so many places in Canada to get printer stuff.

I cannot comment on that but as @TimVukman pointed out Gates belts are mostly used in automotive and I guess there are more shops based in Canada to get these kinds of parts.

deckingman

@timvukman I've been using generic (non-Gates) belts for many years and never had a problem. That's moving a very heavy print head (around 1.5 Kgs) around at high speeds and accelerations. Other users, on other forums have reported that they can't really tell any difference between generic and Gates belts in terms of any print artefacts. I'm not saying that all generic belts are good and maybe there are some cheap Chinese ones around that have issues, but I've never come across any in my own personal experience.

TimVukman

@phaedrux

Thanks for the Canadian distributor list. I have not dealt with Filamensts.ca yet. I'll go check out the products they carry.

Tim
edited to fix spelling

TimVukman

@deckingman

Thanks. Good to know feedback. I'm not sure how much use one would have to have to stretch them. I would think that it would take a while. I know from cutting mine that there is a layer of fiber inside the belt for reinforcement, so it may last quite some time without issue.

TimVukman

@deckingman
Sorry, I missed this in the bunch that came in since I last checked the board. Thanks, that's the one I ordered!

deckingman

@timvukman Yes. They are timing belts. Their function is not to stretch.

I've read several of posts on various forums from people who have tried steel cored belts, thinking that they would be better from a stretching point of view. Then they fail because the steel cores break through being bent around a small pulley, the straightened, then bent - etc etc. Then when the steel core breaks, thee is no support for the rubber so the belt stretches which completely defeats the object of having steel cores.

I think its the tooth profile and what the teeth are made of that is the important thing. If these aren't right, they will wear because of the bad material itself, or because the teeth don't mesh properly with the pulley. If there is a build up of black dust around the pulleys, that's a good indication that something is amiss.

Having said all that, I consider belts to be consumable items which should be replaced periodically - just as one replaces can belts on cars.

Phaedrux

@timvukman said in Nema 23 Questions:

@phaedrux

Thanks for the Canadian distributor list. I have not dealt with Filamensts.ca yet. I'll go check out the products they carry.

Tim
edited to fix spelling

They have a lot of harder to find specialty stuff. And the house brand they use is pretty decent.

TimVukman

@deckingman
That's not a great ad for steel core belts, but I am not surprised. I wonder if they would be a good target for 60 tooth wheels. The bend arc would be much more relaxed.

TimVukman

@phaedrux
Well, that was quite the education on what is available in the filament market. I had no idea there were so many choices. Thanks!

TimVukman

Hi
In going back to belt drive, I've had some issue with skipping, but they seemed to be mechanical. My X axis is mounted inside the printer frame although it is a 20x40 mounted vertically with half of it above the frame. It's been a challenge to find a way to mount the motor so that the gear with the teeth is at the end of the axis.

I'm at a point where the first layer tends to wander around a bit on X. It seems to eventually decide where it wants to be while still in the first layer and then it starts printing properly. I'm only using a fairly small arc of the gear motor so I suspect I need to increase the number of teeth that I am engaging.

I think I will end up mounting the motor to the outside frame and extending the belt.

wilriker

Finally I came around to create the online calculator. See this thread.