Jump to content



Photo

modifying grip on Flyer 2nd gen


  • Please log in to reply
4 replies to this topic

#1 Mark Schlicher

Mark Schlicher

    Advanced Member

  • Sustaining Members
  • 776 posts
  • Nashville, TN

Posted 26 September 2009 - 01:43 PM

I'm considering modifying the grip on my second generation Flyer and would appreciate some input.

The grip is about 3" long and 1.14" OD. In order to have more control (particularly for tilts) I want to extend the length of the grip to 5". I understand the diameter vs. control issue so I don't want to make the OD of the grip too big. Also, I ideally want something that would be non-destructive to the original grip. A PRO Wrapgrip with a 1.5" ID seems to be a good starting place...seems I could have a machinist fix me up with tubular shims to take up the slack. Any other way to do this?

Related, the 3/4" post makes lowmode control quite difficult. I've considered a 3" or so long Delrin sleeve, split down the middle and secured with a thin hose clamp, but the idea of the hose clamp material sticking out doesn't really appeal (plus the time it would take to rig it each time). I've looked at commercially-available shaft collars but nothing is quite the right dimensions. Again it seems like a Wrapgrip with some interior shimming might be the most elegant solution.

I don't want to spend a ton of cash (that could be going to savings for an A2), but I appreciate any input. Thanks!

A couple of additional specific questions:

1. It looks like the original Wrapgrips had 1.5" ID and about 1.8" OD, and are no longer sold on the PRO GPI website. It appears that the Wrapgrip II is 2" ID. Am I correct on these points?
2. Can Delrin be tapped to accept screws without fear of stripping?
  • 0

#2 Erwin Landau

Erwin Landau

    Advanced Member

  • Moderators
  • PipPipPip
  • 1699 posts
  • TBD

Posted 26 September 2009 - 10:01 PM

It's all about timing:

http://www.steadicam...p?recordID=4109
  • 0

#3 Mark Schlicher

Mark Schlicher

    Advanced Member

  • Sustaining Members
  • 776 posts
  • Nashville, TN

Posted 27 September 2009 - 04:32 AM

Yes, I saw your post, it is very interesting. :-)

Does your wrapgrip have a 1.5" inside diameter? I'm also wondering about the oversized outside diameter, how might that be detrimental to a small rig?

It's all about timing:

http://www.steadicam...p?recordID=4109


  • 0

#4 Jerry Holway

Jerry Holway

    Advanced Member

  • Sustaining Members
  • 737 posts
  • Philadelphia

Posted 27 September 2009 - 10:44 AM

Mark-

very curious about your wish to extend the handgrip for tilts - control is going to go down as you grab the rig further and further from the c.g.. If you are having trouble holding a tilt, I suggest a less bottom heavy sled.

A bigger diameter grip will also have more influence (again the further from the c.g. one touches the rig, the more angular influence) but the difference at the level of 1.4 inches vs 1.5 or 1.8 may be easily overcome by improved technique if you prefer the feel of it.

Tapping Delrin with small threads in thin sections (in the order of 20 TPI, smaller than #10, 1/4" or so thick) can easily strip the threads, so the use of helicoils is better (same for most aluminum) - it's all about the application, how long it should last. I've often made test parts with 4-40 threads in thin Delrin... and it can work if the loads are light. Use taps that have NEVER touched metal for best results.

Modification is a process of discovery, and some of it will be painful (time, energy, $$, Oops-I-should-have-known-that -head-thumping, etc.)

Jerry
  • 0

#5 Mark Schlicher

Mark Schlicher

    Advanced Member

  • Sustaining Members
  • 776 posts
  • Nashville, TN

Posted 27 September 2009 - 02:26 PM

Jerry,

When attempting a proper grip, with my pinky in position to control pendular motion and aid in tilting, (pp50-53 in your book) I find that it falls below the 3" length of the Flyer's grip, and doesn't comforably rest on the 3/4" post. The small diameter post seems to make it harder to reach the post "dead center" with my pinky when tilting. My idea is to wrap a longer grip around the existing grip, extending it to a total of 5", so that my entire hand can rest on it in a proper, relaxed grip. So, it's not that I want to grap the grip further from the CG, I just want to be able to spread out my hand without hanging off the end of the grip. I have small hands and not very strong pinkies, FWIW.

I'm using a drop time of a little over 2 seconds, and my tilt issue isn't so much holding it as improving my ability to control it, given the skinny Flyer post.

Low mode is a similar problem but worse, I can't get a good grip on that slippery little post....

Does that clarify? Granted that I'll keep getting better with practice, but I thought if I can improve the rig in this way it would help me get better quicker. What do you think?

Thanks for your info on working with Delrin, also.

Mark-

very curious about your wish to extend the handgrip for tilts - control is going to go down as you grab the rig further and further from the c.g.. If you are having trouble holding a tilt, I suggest a less bottom heavy sled.

A bigger diameter grip will also have more influence (again the further from the c.g. one touches the rig, the more angular influence) but the difference at the level of 1.4 inches vs 1.5 or 1.8 may be easily overcome by improved technique if you prefer the feel of it.

Tapping Delrin with small threads in thin sections (in the order of 20 TPI, smaller than #10, 1/4" or so thick) can easily strip the threads, so the use of helicoils is better (same for most aluminum) - it's all about the application, how long it should last. I've often made test parts with 4-40 threads in thin Delrin... and it can work if the loads are light. Use taps that have NEVER touched metal for best results.

Modification is a process of discovery, and some of it will be painful (time, energy, $$, Oops-I-should-have-known-that -head-thumping, etc.)

Jerry


  • 0




GPI Pro Systems

Paralinx LLC

PLC - Bartech

Ritter Battery

Wireless Video Systems

Engineered Cinema Solutions

Omnishot Systems

Boland Communications

Media Blackout - Custom Cables and AKS

BOXX

SkyDreams

PLC Electronics Solutions

rebotnix Technologies

Teradek

Varizoom Follow Focus

Betz Tools for Stabilizers

IDX