Author Topic: Losmandy's New One Piece Worm Block (OPWB)  (Read 591 times)

Eric Shaffer

  • Active Astronomer
  • ***
  • Posts: 131
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: Losmandy's New One Piece Worm Block (OPWB)
« Reply #15 on: January 31, 2018, 12:50:06 PM »
Quote
Quote

I don't know why Losmandy calls it a "one piece worm block" when it is still a pile of separate pieces. I wish they really would come out with a true monolithic worm block design upgrade for Losmandy mounts.

And dump those awful, evil Oldham couplers! They have been the culprit behind a lot of ruined images.

It is obvious that you have a vendetta against Oldham couplers....how does that fact or any of this post help here?

Vendetta against Oldham couplers? Hardly. I just believe in using the right technology for the right applications and Oldham shaft couplers are the wrong technology for coupling motors to worm drives in telescope mounts. They tend to "pop" along instead of smoothly slide along as the shafts rotate. That makes them a bad choice for astrophotography. Note that no other mount manufacturer except Losmandy still uses Oldham couplers.

There are a lot of other shaft coupler designs out there that can compensate for minor shaft misalignment. Bellows, Farnal, spiral, etc. I wish that Losmandy had chosen spiral or Farnal over Oldham.

Jacob Julian

  • Active Astronomer
  • ***
  • Posts: 145
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: Losmandy's New One Piece Worm Block (OPWB)
« Reply #16 on: February 09, 2018, 07:37:34 AM »
Quote
Quote

...it still falls far short of the mark of what a true monolithic worm block design should be.


You mean expensive? The Ovision block costs $540 whereas the one-piece solution from Losmandy goes for $175. There's probably some future risk that components will loosen up in the Losmandy block, like you've mentioned, but in an almost 0 vibration environment like a GEM axis we're probably talking about decades.

Regarding disassembling and mis-aligning things, that was the biggest issue with the two-piece block. This resulted in the infamous 76s error. I've personally taken apart the previous OPWB several times (I do like to tinker) and have yet to see a 76s error bump in my PE analysis. This tells me that it's very difficult to throw out of alignment. I'm 100% confident that even if things did loosen up over time, simply tightening them will be all that's needed to restore it to factory performance.

Personally, I'd rather have the extra $365 to put towards a new eyepiece or other astro gear.

I am not talking about expense and I am not advocating for Ovision. I posted the link to the photo to demonstrate the difference between the two and to make it clear what a monolithic worm block actually looks like.