Thread 2948784

Problem is, I can't shell out for a new one. I have $1k max for a turbomolecular pump and a roughing pump. These are what I'm looking at:
https://www.ebay.com/itm/136529768769
https://www.ebay.com/itm/257108806986
Either way, I really can't have one grenade at 75,000 rpm. There's also the matter of the controller, which can be as expensive as the pump, or more. Not sure if I really want to DIY a high frequency three phase inverter. Again, I don't want to blow myself up.

Any advice?

>>2948784 (OP)
The 2nd listing already includes the controller.
The casing is thick enough to contain any explosion, I've seen plenty of the turbo-v series pumps explode and the blades normally just shred themselves without even really damaging the protective screen on the top

>>2948784 (OP)
>buying a rando used turbo pump
>expecting it not to be previously fucked
lol
lmfao even
nobody ever sets up pump management on uhv systems then a power drop stops the roughers and bam all the turbos smack atmosphere
buy a turbo from a rebuilder if you want better than a 50% success chance
t. instrument maker at research fab

>>2948786
Well at least I won't blow myself up, but electrocution is still on the table.

Yeah the second one does come with a controller. I've seen cheap/simple controllers like that around the $200 mark (which is the difference in price between the two listings), although that's on the low end.
I will probably set up an Arduino to manage it anyways so lack of features is not a big deal as long as it works and doesn't randomly shit the bed.

>>2948787
I just don't have $5k to drop on a turbo pump, so I'm gonna have to roll the dice.