timing belt instead of lead screw

[Jonathan]

Not very fair that comment.!! I have bought literaly dozens of ballscrews screws from China and only 1 was ever so slightly bent and twenty minutes later straight.

I've only had 10 ballscrews from Chai but were all straight and fine, including the 2m long 25mm screws. Not actually measured how bent they are as that's easier said than done to do accurately, but I've not had any problems with them.

But, How many people here will buy dozens of screws for their small home built machines. Not too many I think.

That's not the point ... Jazz and I have bought 'dozens' between us only had one bent screw. So the probability of getting a bent screw is one in dozens which sounds good to me for the price. Even if you buy them from Zapp they may still be bent, as happened to someone on this forum long ago. I guess your parcel unfortunately got something very heavy put on top of it in transit which bent two out of three screws.

One thing to consider is I bought 4 of my ballscrews with the linear rails as when the ballscrews are bundled together with the rails that will strengthen the package and make them less likely to bend in transit.

I've got 2 of the VFDs and the only problem I had was my own fault for not securing a wire properly. They're both working fine now on the lathe and router.