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Author Topic: Water Jet Drives & 3D Printing  (Read 30836 times)

Martin [Admin]

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Re: Water Jet Drives & 3D Printing
« Reply #175 on: August 26, 2017, 02:09:26 PM »


Could you set up the Tx or ESC to give, say, a one second pause between forward and reverse to allow the bucket to move?
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IKB

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Re: Water Jet Drives & 3D Printing
« Reply #176 on: August 26, 2017, 03:07:21 PM »

Hi Martin,


I'm sure it is possible with a modern computerised TX, but not with my old school F14, plus, who wouldn't want working hydraulics on their boat?  O0


Alex
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richald

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Re: Water Jet Drives & 3D Printing
« Reply #177 on: August 26, 2017, 04:12:46 PM »

Oil try it if it works . . . :P

Richard
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IKB

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Re: Water Jet Drives & 3D Printing
« Reply #178 on: August 26, 2017, 04:58:14 PM »

Groan, yes Richard, very drole  :((
Planning to have new sysetm installed and tedt next club sunday, how's the race prep of your 500 going?


Alex
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richald

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Re: Water Jet Drives & 3D Printing
« Reply #179 on: August 26, 2017, 05:18:03 PM »

It was either that or Oil get me coat!

Don't want to divert/hijack your thread so will PM you

Richard
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Martin [Admin]

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Re: Water Jet Drives & 3D Printing
« Reply #180 on: August 26, 2017, 06:55:18 PM »


I had a Lego technic set with hydraulics, there weren't very efficient.... what about cycle hydraulic brakes .... or are they way too expensive?

.... medical syringes?!
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bfgstew

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Re: Water Jet Drives & 3D Printing
« Reply #181 on: August 26, 2017, 07:06:32 PM »

Wheelspin models have a set of shocks (spring and oil filled), think about 15 a pair. Got to be better than Lego methinks?


Stewart
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Re: Water Jet Drives & 3D Printing
« Reply #182 on: August 26, 2017, 07:24:13 PM »

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IKB

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Re: Water Jet Drives & 3D Printing
« Reply #184 on: August 26, 2017, 08:37:32 PM »

Hi Guys,


Answers below:


  • Martin - Bike hydraulics are really expensive and designed for a very specific purpose,s o very hard to adapt, but nice idea
  • Stewart - The shocks may be worth looking at as they are essentially miniature rams, but for the time being I am going to try and find an off the shelf solution with builtin ports
  • Grendel - I have seen some very similat to this and they may well be purchased in future for another prototype, I am keen to see if the Lego ones can be adapted as they are the perfect size for my application
Alex
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grendel

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Re: Water Jet Drives & 3D Printing
« Reply #185 on: August 26, 2017, 10:20:23 PM »

http://www.nzmeccano.com/image-116933
how about the meccano hydraulics on their new John deer excavator, these have water as an operating medium.
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IKB

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Re: Water Jet Drives & 3D Printing
« Reply #186 on: August 26, 2017, 10:25:19 PM »

Hi Grendel,


That is essentially the idea I am going for, except a servo will be doing the job of actuating the cylinders


Alex
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IKB

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Re: Water Jet Drives & 3D Printing
« Reply #187 on: October 20, 2017, 06:41:10 PM »

Hi Guys,


Quick update to explain my recent absence, well work basically, well that and with BMBS having built a storming rock crawling track recently, I have kind of got caught up in all the excitement of new things to do, plus as I type I am on site in Riyadh for 3 weeks for work, but fear not, the jet boat will return, I am currently trying to iron out the kinks from the latest reversing mechanism and then there will be updates.


Alex
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TugCowboy

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Re: Water Jet Drives & 3D Printing
« Reply #188 on: March 11, 2018, 12:53:45 PM »

Hi Alex,

From your experience would you say PLA impellers work OK?
I've recently been playing with a variation on a jet drive to fit a few boats my Son wants to build and although the drives themselves seem absolutely solid I guess I'm just not sold on the idea of a printed impeller.

All the best,

Alex (Another one)
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IKB

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Re: Water Jet Drives & 3D Printing
« Reply #189 on: March 12, 2018, 10:38:32 AM »

Hi Alex,


I have had no issues using PLA printed impellers, once I had resolved how to pin it to the shaft properly, my current iteration runs approximately 2.6 hp, they also stand up well to all sorts of ingestion damage as well as still performing well after a coupling slip and grinding on the inside of the tunnel.


Would love to see photos of your projects, post them on here or PM me if you prefer


Alex 
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Re: Water Jet Drives & 3D Printing
« Reply #190 on: March 13, 2018, 11:17:16 PM »

Hi Guys,


Quick update, finally got around to making some progress on the jet drive, indirect progress, but progress none the least, with my decision to have pneumatic reverse, I am in need of an onboard air supply, so I have cobbled this together from the motor gearbox from an FTX Outback crawler, a Technic pump and some 3D printed parts to hold everything together


Quick video of the bench test, this is running on 3v and is much quicker on 5v, but needs bolting down: https://youtu.be/JcuTWPhYsiE


Alex
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jarvo

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Re: Water Jet Drives & 3D Printing
« Reply #191 on: March 13, 2018, 11:28:03 PM »

What about the air retracts the plane boys use???  Come in different sizes and combined with your compressor they have a long travel as well


Mark
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IKB

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Re: Water Jet Drives & 3D Printing
« Reply #192 on: March 29, 2018, 12:51:05 PM »

Hi Mark,


Thanks for your reply, I have looked into various commercially available ram systems before and the aircraft stuff is good, although a bit pricey, all of the units I have seen out there all have the same issue, and that is they are of a stroke length that is not suitable for my application.


The other side to the route I am taking is, I really enjoy the challenge of creating my own bespoke solutions from relatively inexpensive parts, usually using them in ways they were never designed to be in the first place, it is the journey of discovery that is enjoyable... or you could say I'm a penny pinching, stubborn, masochist, either  way, I'm enjoying my tinkering time in the ShedShop!  :-))


Alex
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IKB

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Re: Water Jet Drives & 3D Printing
« Reply #193 on: May 02, 2018, 12:07:37 AM »

Hi Guys,


Busy working on the jet boat ready for next weekend, this time around I should have pneumatic reverse, a heavily re-worked reversing nozzle and a new drivetrain using a 5065 270Kv Outrunner more commonly found in electric skateboards, this will be running through a 3:1 gearbox to give approximately 19500 RPM, but hopefully give a big reduction in current draw for more fun time on the lake


Alex
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jarvo

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Re: Water Jet Drives & 3D Printing
« Reply #194 on: May 02, 2018, 08:41:17 AM »

HI Alex, that looks superb, can't wait to see it in action,


Mark
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IKB

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Re: Water Jet Drives & 3D Printing
« Reply #195 on: May 05, 2018, 03:47:31 PM »

Hi Guys,


Update from the ShedShop, been very busy and we are ready for testing tomorrow!  :-))


  • New steering setup using 3mm rod & proper rose joint ends, this has always been a real weak point of the unit, but no more, this is rock solid - https://youtu.be/UlGOr_pW_sU
  • Updated reversing mechanism with pneumatic actuation, the rams do work, but I haven't had chance to design and build an RC valve to control the setup - https://youtu.be/_Mk7_Z1FOAQ
  • New Outrunner installed and ready to go, not got the new Vesc setup yet, so will test on old ESC and see how we get on, bench test seem good though


Alex
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