roberlin wrote:I like your beefy brackets
What kind of couplers are those?
After switching to a totally rigid motor mount, I found I was still getting a little wobble no matter how much I fiddled with the alignment.
The last mile for me was swapping out my rigid coupler for a flexible one (simultaneously I ditched my mcmaster-carr ACME for precisiontech which may also have helped).
Since then I don't have perceivable (to me) wobble.
If I was approaching it today, I would try one of the versions of brnrd's wobble suppressor. But at this point I am hesitant to fix what ain't broke.
I started out but spinning the lead screw on the lathe and tweaking it until I removed as much of the wobble as possible.
The couplers I machined on my 12x36 lathe out of 1/2 aluminum stock. I started by drilling and tapping a hole on one end for the lead screw. Threaded the coupler on the lead screw, then spun down the lock nut and tightened it. Flipped the assembly around and carefully clamped the lead screw threads in a 5c collet close to the coupler. Bored the motor hole and precision fit it to the motor shaft almost a press fit. Cross drilled the set screws 180 deg out on the Bridgeport.
Another option would be to get a slightly larger lead screw and bore the 5mm hole directly into the end of the lead screw.
I wanted to see how things worked with with the rigid couplers as an experiment. I have a set of 12mm x 300mm ball screws sitting here with couplers. I doubt that will yield much improvement. I really wouldn't mind finding a higher quality lead screw that runs true.
I am quite happy with the prints now. The photos are taken with an iPhone 5, which really seems to show off imperfections that you might not see when just holding the prints in your hand. I was at a printer party this weekend with about 10 printers. The best prints that we witnessed came off a replicator 2 and a ulitamaker. Both running PLA with a .4 nozzle and .15 layer height. I would say this ORD is as good as the best we saw this weekend.
I will be machining some different motor and pulley mounts next. I have to assume the original mounts are jumping around a bit during high speed motion changes.