EP1 - CNC3018 Rebuild - Intro & Initial Build
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- เผยแพร่เมื่อ 26 ก.ย. 2024
- In this episode, I will discuss how I intend to upgrade the CNC, and I will also make a start on some of the larger assemblies that will help my lock in the final plan for the structure and size of the final CNC.
This is the first episode in a series where I upgrade my cheap 3018 CNC in an effort to improve its precision, performance and work area size.
Great video mate.
Thanks!
Looking forward :D
I'm really looking forward to this series, l've been down this rabbit hole on my once was a 3018. I ended up going to all linear rails to get rid of the flex too.
FWIW those lead screw nuts aren't suitable for CNC machines and I found this out the hard way. I've now gone to lead screws and anti backlash blocks from open builds.
Btw check out my CNC videos for links to the upgrades l've made. Some of the posts might be useful.
Cheers Derek.
Just found your comment was blocked for inspection by TH-cam, not very nice really.. and buggered if I know why that would be the case. Anyway, given all the stuff you have already done with your CNC3018, I do hope you find my noob series amusing. BTW: I know those leadscrews and nuts are garbage, actually I am just swapping bad with bad in that regard. But this is what the budget I set myself allowed, and as this was not the worst part of the original CNC3018, so yeah..
@@ForOurGood cheers, I wondered why it disappeared. 🤣I really enjoy seeing the solutions other folk come up with. Just because I choose a certain path, doesn’t mean that’s the best option for everyone else. With the anti backlash nuts, I found the springs aren’t strong enough to be useful in a CNC machine. I also found the cheap Chinese lead screws to have poor accuracy. I bought my new ones from MakerStore here in Australia, but I believe they are from OpenBuilds. They are TR8x8 with 4 starts and only about $29 for 540mm or $15 for 300mm.
I know what you mean when you say about spending money on AliExpress when it come to Cnc machines😂
Why did you not use rails instead? Do those bearings blocks don't have any play?
I have a 3020, supposedly better, thicker rods, but in reality is bullshit. Yes more solid but has lots of play in the linear bearings.
My idea is to move all to rails, don't have gear to pick proper tolerance rods and make holes and threads at the ends.
The reason I used the rods instead of rails for the y-axis is simply cost, I had set myself a total USD100 spend budget for this rebuild, and to be honest, I was probably slightly over that, but putting rails on Y too would have pushed me way over. As far as I can tell, the 12mm rod and blocks don't have any notable play. If you have play, check if the play is between the rod and bearing or block and bearing, if it is between block and bearing then add green loctite to fix that. Honestly, if I do a scratch build, I will use rails everywhere, but this was a rebuild, and I was trying to keep it somewhat honest to the original 3018 design and low cost. So far I am happy with the rods however, they are rock solid and no notable play. They were easy enough to implement (for me), and dust dropping down on simple rods, and not down into complex rails, seems to make more sense given the way the CNC3018 is configured. Thanks for the comment!
@@ForOurGood Suspected cost was the reason, thanks for the reply.
Play is between rods and bearing, bough a set of bearings (cheap) and is the same. it comes with small LMU12 and I swapped to long ones but still no luck. I agree structure and rods are solid (for this size) but this play kills. Might design a 3D printed carriage putting the bearings under while I wait for the rails.
Keep up the good content, curious to see whats next. Cheers
@@Nandox7 I can only assume the rods are slightly undersized. Be rods, rails or leadscrews, the quality is a bit of a hit and miss when you buy from places like Ali-Express. Generally I try to stick to Ali stores which heavily specialise in the genre of whatever I am buying, and have sold heaps with good reviews.. even if that costs a little more, it is very much worth it (I still get burnt on the occasion, but usually Ali refunds the total amount). Good luck with fixing your problem.
@@Nandox7 Hey there, just a quick follow up on this. I was testing the CNC and found some huge play in the bed. Thanks for your comment, you heightened my attention to this issue, and I began checking more carefully. After disassembly I found that basically the bearings are completely loose in those blocks, no green loctite at all.. I also found the orientation of the bearings seem to affect the final amount of play. Anyway, I am in the process of fixing that now. I know you said you checked, but maybe it is worth checking again to see if the bearings are actually fixed into the blocks with green loctite. Take the clip off and see if they fall out!