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6DOF for under £1000 - Shopping list help please!

Discussion in 'DIY Motion Simulator Projects' started by Paul Shortland, Jul 15, 2015.

  1. Paul Shortland

    Paul Shortland Active Member

    Joined:
    May 13, 2015
    Messages:
    154
    Location:
    Northampton - UK
    Balance:
    317Coins
    Ratings:
    +74 / 1 / -0
    My Motion Simulator:
    2DOF, AC motor
    Hi All,

    I recently built a 2DOF using @Wanegain 's kit, so arduino and sabertooth. It is excellent fun and gets used for many hours a week and cost under £400.
    The recent flood of 6DOF builds has me wondering how much money I need to attempt one myself so I have been compiling a shopping list to save up for.
    Any views on the listed components and help on finishing the list would be gratefully received. I am UK based so I am looking for UK suppliers or at least those that ship here for a reasonable cost.

    Thanks in advance :cheers

    Costs so far...
    £455.88 Motors
    £236.40 Drivers
    £ ? PSUs
    £50.97 Arduinos
    £24.78 Rods
    £52.27 Ball Joints
    £ ? Shaft couplers
    £ 83.88 Pots
    £ ? Sundries

    £904.18 +

    Details...
    6 Motors
    12V DC Geared Motor, Motor with 60:1 ratio Gearbox
    Voltage: 12V
    Current: 23A
    Speed: 80RPM
    Torque: 15Nm
    Peak Torque: 30Nm

    http://www.ebay.co.uk/itm/111714339805?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT

    6 x £65.99 + £9.99 p&p = £455.88
    3 Motor Drivers
    Sabertooth 2 x 32

    http://www.robotshop.com/uk/sabertooth-dual-2x32a-6v-24v-regenerative-motor-driver.html

    3 x £78.80 = £236.40
    3 Power Supplies

    ????
    3 Arduino Unos

    Ebay

    3 x £16.99 = £50.97
    6 M12 Rods

    http://www.screwfix.com/p/bright-zinc-plated-steel-threaded-rods-m12-x-1000mm-pack-of-5/98942

    2 x £12.39 = £24.78
    12 M12 BallJoints

    http://www.akbearings.co.uk/product.asp?P_ID=879&strPageHistory=related

    12 x £4.19 + £1.99 p&p = £52.27
    6 Shaft Couplers

    ????
    6 x Hall Effect Pots

    6 x BI TECHNOLOGIES / TT ELECTRONICS
    6127V1A180L.5
    £83.88

    Wood, screws, bolts, metal, cables, brackets etc.

    ????
    Last edited: Jul 16, 2015
    Paul Shortland, Jul 15, 2015
    #1
  2. bsft

    bsft

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    bsft, Jul 15, 2015
    #2
  3. Paul Shortland

    Paul Shortland Active Member

    Joined:
    May 13, 2015
    Messages:
    154
    Location:
    Northampton - UK
    Balance:
    317Coins
    Ratings:
    +74 / 1 / -0
    My Motion Simulator:
    2DOF, AC motor
    Cool, didn't see that thread. Have been reading all the 6DOF ones I can find!
    Paul Shortland, Jul 15, 2015
    #3
  4. Mmcool

    Mmcool Member

    Joined:
    Jun 26, 2015
    Messages:
    67
    Location:
    USA
    Balance:
    1,174Coins
    Ratings:
    +19 / 7 / -0
    My Motion Simulator:
    2DOF
    Well, I still could not be given an answer on the cost of the only 6DOF here that is working... I wonder if anyone knows...

    Mike
    Mmcool, Jul 15, 2015
    #4
  5. Paul Shortland

    Paul Shortland Active Member

    Joined:
    May 13, 2015
    Messages:
    154
    Location:
    Northampton - UK
    Balance:
    317Coins
    Ratings:
    +74 / 1 / -0
    My Motion Simulator:
    2DOF, AC motor
    To me it seems like the motors are the key unknown cost, if these could do the job then sub £1000 is a go I think. Possibly less if cheaper wiper motors can be found but I am ok at the £65 a motor if they can handle the job.

    12V DC Geared Motor, Motor with 60:1 ratio Gearbox
    Voltage: 12V
    Current: 23A
    Speed: 80RPM
    Torque: 15Nm
    Peak Torque: 30Nm
    Paul Shortland, Jul 15, 2015
    #5
  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
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    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    148,616Coins
    Ratings:
    +10,909 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    I think you are wise to stick with the motors you have chosen over wipers, as the latter are pretty marginal.

    The downside with the 60:1 wormgear boxes is that mechanical efficiency drops a lot with increased ratio, anywhere from 10 to 50%. It will be interesting to see how the motors you have chosen perform in actual use.

    @SilentChill uses very powerful motors that are operating way above their stated specifications and was he able to save on costs by scavenging them, which for most of us is not an option. The other cost saving approach is building DIY actuators, like @SeatTime. The actual parts cost for @SeatTime's actuators is not that high but the labor cost and skills needed are.

    I guess you could go down the 60:1 lever path and if needs be consider converting to DIY actuators if performance is found to be an issue. Either way kudos to you in further experimenting with DC 6DOF, we all learn something from pioneers such as @SilentChill, @SeatTime and yourself.
    noorbeast, Jul 16, 2015
    #6
  7. paulg100

    paulg100 Active Member

    Joined:
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    Messages:
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    Location:
    Bristol UK
    Balance:
    1,373Coins
    Ratings:
    +94 / 2 / -0
    My Motion Simulator:
    3DOF, DC motor, 6DOF
    6 x Hall Effect Pots
    ????
    for your shopping list:
    6 x BI TECHNOLOGIES / TT ELECTRONICS
    6127V1A180L.5
    £83.88

    3 Arduino Unos - MAPLINS! stay away from that place unless you like throwing money away :)
    can save at least 50% using ebay for your unos or more with copies.

    Shaft couplers - Allow about £1.60 each so say £10
    • Informative Informative x 1
    paulg100, Jul 16, 2015
    #7
  8. Paul Shortland

    Paul Shortland Active Member

    Joined:
    May 13, 2015
    Messages:
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    Location:
    Northampton - UK
    Balance:
    317Coins
    Ratings:
    +74 / 1 / -0
    My Motion Simulator:
    2DOF, AC motor
    Excellent, thank you. Genuine arduino's save £24 visa Ebay :)
    Updated the list :grin
    Paul Shortland, Jul 16, 2015
    #8
  9. Paul Shortland

    Paul Shortland Active Member

    Joined:
    May 13, 2015
    Messages:
    154
    Location:
    Northampton - UK
    Balance:
    317Coins
    Ratings:
    +74 / 1 / -0
    My Motion Simulator:
    2DOF, AC motor
    No rush on this build so I have time to hunt down the bargains. Looks like a more powerful motor would be better?
    Is there a motor you can suggest? Performance and ease of build are my main concerns over price.
    Paul Shortland, Jul 16, 2015
    #9
  10. paulg100

    paulg100 Active Member

    Joined:
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    Location:
    Bristol UK
    Balance:
    1,373Coins
    Ratings:
    +94 / 2 / -0
    My Motion Simulator:
    3DOF, DC motor, 6DOF
    if you want to stick with 12v and <30amps i think you will struggle to find much better than these.

    From china there are 23nm ones at 43 amps (100rpm), works out about £700 for 6.
    Or 40nm ones at..... an eye watering 80 odd amps!!! more a less the same price.
    Basically about 100$ each, betime you add shipping and import taxes will be about £700/£750 odd.

    Not sure what the holding torque is on those gear box's though as its a 30:1 gearbox for 100rmp on those. I think the gear boxes and motors are very similar or the same as the industrial/heavy duty ones on the motion dynamics site.

    PSU's factor £10-15 each x 6
    • Informative Informative x 1
    Last edited: Jul 16, 2015
    paulg100, Jul 16, 2015
    #10
  11. Paul Shortland

    Paul Shortland Active Member

    Joined:
    May 13, 2015
    Messages:
    154
    Location:
    Northampton - UK
    Balance:
    317Coins
    Ratings:
    +74 / 1 / -0
    My Motion Simulator:
    2DOF, AC motor
    These sound interesting, would you have a link?
    Paul Shortland, Jul 16, 2015
    #11
  12. paulg100

    paulg100 Active Member

    Joined:
    Nov 15, 2014
    Messages:
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    Location:
    Bristol UK
    Balance:
    1,373Coins
    Ratings:
    +94 / 2 / -0
    My Motion Simulator:
    3DOF, DC motor, 6DOF
    here somewhere,

    http://hzhengbai.en.alibaba.com/productgrouplist-801280903/DC_motor_with_gearbox.html

    have been in touch with them, very helpful. part of ZYT series with NMRV50 gearbox. Have all specs, prices and shipping costs.

    there is a 24v version as well, 700watt. high torque, and amps within 2x60 sabertooth... but PSU's are not so easy with 24v.
    either lots of 12v's in parellel or 6 x 24v psu's which from china again about $100 each.

    Or maybe battery combo??

    TBH once you start getting into 24v and 3 x sabertooth 2x60 teritory you may as well almost just go AC and have done with it, i doubt the price would be much different?
    • Agree Agree x 2
    • Informative Informative x 1
    paulg100, Jul 16, 2015
    #12