Tagged: 8mm lead screw
- January 30, 2017 at 3:59 pm #26351
What lock nut do I need for this rod?
I tried 8m x 1.25 and the pitch is wrong…January 30, 2017 at 4:00 pm #26352
This is to replace the 5/16 rod with a typical reprap rod…January 30, 2017 at 4:01 pm #26353
Yikes and I met coupling nutJanuary 30, 2017 at 4:13 pm #26354
I believe that M8 only comes in two pitches – 1.25 is coarse, and 1.0 is fine pitch. Someone can correct me if I’m wrong, but I would get M8-1.0 for the Z axis. That means that your threads are 1.0mm apart (I hope I’m not over explaining – I just try to be thorough).January 30, 2017 at 4:22 pm #26356
FWIW – for Imperial hardware the Parts page says to use 5/16-18 which is the coarse thread version of 5/16 – https://vicious1.com/blog/parts
You will have to adjust your firmware either way, so maybe it doesn’t matter. I believe I have fine pitch for the Z axis.January 30, 2017 at 4:36 pm #26359
Where do I get the coupler for the lead screw m8? I only have seen m8 – 1.25 which does not workJanuary 30, 2017 at 5:08 pm #26366
I think I misunderstood you. Are you trying to use a lead screw or M8 threaded rod with a coupling nut?
If you are talking about a lead screw, you could try this thing along with a lead screw nut, but I have no idea if it would work since the designer hasn’t even tried it: http://www.thingiverse.com/thing:1727299
(On that note, I can’t find a M8-1.0 coupling nut. I would just buy threaded rod that is M8-1.25, or stick with 5/16.)February 4, 2017 at 9:08 am #26707
I was able to fix this by purchasing a 8mm 2mm pitch lead screw on amazon. It came with the coupler (round).
T8 300mm 8mm Lead Screw with Coupler
I then bored out slightly the top piece for the Z carriage assembly and inserted the coupler into the top. This prevented the restraining bolt to completely screw down, but it was through the whole assembly and allowed rigidness.
See Pictures of the assembly with the coupler and lead screw installed.
I had to update the firmware for the Z steps reducing to 800.
I then added grease to the lead screw and ran it up and down a few times. raising it 160mm each way. This allowed pushing the grease through all the threads.
I the lowered it and zeroed it as we normally do…
Did a test print – Viola! perfect horizontal prints… wow in fact you cannot see the lines at all… barely at .2mm
RECOMMEND this solution over the supplied 8mm or 5/16 solution… as its ridged enough to never be bent and is incredibly accurate.
Attachments:February 4, 2017 at 10:15 am #26721
Before you recommend it make sure it works with a heavy router and you have a look at the FAQ’s.
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