I have built an MPCNC Burly and am thinking about upgrading it to Primo. In the process of looking at the parts list and walking by my local hardware store on a daily basis to work, I couldn’t find full thread 5/16 x 1.5" hex cap bolts. The best they had was 5/16" x 1.5" hex bolts with a partial
Now my question, will these work in the Primo built or should I scour the web for full thread M8x40mm bolts? Any advice is much appreciated. From my searching around the web and this forum, it sounds like the partial thread bolts should work just fine but I wanted to make sure before I waste money on them. The only other thread I could find was this one
Partial thread are fine. The 1.5" bolts included in Ryan’s Burley-to-Primo upgrade pack have about 1" of thread.
If you’re looking to buy a lot of hardware, I’ve used The Nutty Company several times. I used to use Bolt Depot, but when I compared a couple times, I saved a few bucks by using Nutty.
I have an MPCNC with full thread and others with partial threaded bolts and I don’t see any differences in the finished product. My guess would be that partial thread is theoretical even better as it is closer to the hole diameter than the thread itself is.
But in the end the design of the MPCNC allows for both types of bolts to work equally well as it is designed to grip around the tubes.
Hi, I just build mine with full thread screws, I choosed to get “Allen” heads for both M5 and M8.
I set it up with washers everywhere it was possible to do between PLA and bolt or screw head.
It looks professional !
According to me, using full thread screw give you the option to not re-drill holes to make it fit.
(check in my profile, there is a link to my facebook page where I log my build)
Sometimes, the full threads can hinder smooth running when tightening bolt when adjusting the position of the parts. I ran the bolt with a drilling machine, to rip the inside of the bolt holes, so that it moved smoothly. But I don’t think it’s necessary, because they will slip eventually, when used.
