[PSUBS-MAILIST] gear set

Thu Oct 26 09:56:14 EDT 2017

 Ian,Good you included a picture, the large gear is not secured to the shaft.  The shaft turns freely through  the gear.  The gear is bolted to the hand, if you print the gear with small holes (1\4 inch) instead of large, I can use those holes to mount it, maybe the holes should be beefed up a bit.  Thanks againHank
    On Wednesday, October 25, 2017, 11:51:48 PM MDT, irox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 #yiv0835368937 #yiv0835368937 -- DIV {margin:0px;}#yiv0835368937 
Hi Hank,
So,the 3" gear would weigh ~60g printed at 100% in fill (I'll print it at 20% in fill for speed, meaning it has an install structure, but with voids, weighing ~30g)the 1" gear would weigh ~15g printed at 100% in fill (I'll print it at 20% as well, weighing ~5g)
Top and bottom will be at least 1mm thick, side walls will be 0.8mm thick.  I made the gears 0.5" thick, but here is a collar for the set screw which adds a bit of bulk/thickness too.  If that's a problem it's easy to explore other designs.
I'll print them tonight and can mail them tomorrow if you like.  Email me your mailing address at irox<at>ix.netcom.com.
Cheers!  Ian.

-----Original Message-----
From: hank pronk via Personal_Submersibles 
Sent: Oct 25, 2017 2:36 PM
To: irox via Personal_Submersibles 
Subject: Re: [PSUBS-MAILIST] gear set

 Ian,Thank you, if you want to print some then I can just keep building and allow for the size. The shaft for the big gear is 5\8 and the shaft for the small gear is 1\4 inch.  I do not have a weight budget, just keeping at light as I can.  The nice thing with plastic is the low density.   In a perfect world the the large gear would be 3 inch dia and the small gear would be 1 inch.The thickness can be 1\2 inch giving it some extra strength.  I can drill out the centre with my lathe.  Thank youHank     On Wednesday, October 25, 2017, 11:51:39 AM MDT, irox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 #yiv0835368937 -- DIV {margin:0px;}#yiv0835368937 
Hi Hank,

how much of a weight budget do you have for this item?

You mentioned a 0.5inch and 2.5inch gear early, this would give a shaft to shaft distance of 1.5", is that what you need?
I did a quick design (spent about 2 minutes on it) for a herringbone gear set matching that, with a 0.25" shaft size (and a set screw provision).
What gearing ratio range are you hoping for?
Do you care about the thickness?

I'm happy to finish the design and print it as an academic exercise, and mail it to you.  No pressure to use it.  I would print it PLA which might not be strong enough.  But if it was working for you, it could be printed in ABS or  Nylon.

Cheers,
  Ian.

-----Original Message-----
From: hank pronk via Personal_Submersibles 
Sent: Oct 25, 2017 4:25 AM
To: irox via Personal_Submersibles 
Subject: Re: [PSUBS-MAILIST] gear set

 Hi Ian,I am stuck on plastic for weight, but I am probably over thinking that.  It is, after all, such a tiny part.  I never thought of Amazon, I will check that out.  Thank you for the offer to print them, I had no idea that such a fine part could be printed. Hank
    On Tuesday, October 24, 2017, 7:53:44 PM MDT, irox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 #yiv0835368937 -- DIV {margin:0px;}#yiv0835368937 Could you 3D print them?  Or mill them to your needs?
I'm guess that if you're picking plastic strength is too a big of a concern.  But do you have an idea of the strength requirements?  Type of plastic?What type of center do you need?Could even do this in herronbone teeth.I could potentially print you up some gears and mailing them to you.
There is always Lego Technic gears as well:https://www.brickowl.com/catalog/lego-parts/technic/gear
Cheers, Ian.

-----Original Message-----
From: Brian Cox via Personal_Submersibles 
Sent: Oct 24, 2017 4:08 PM
To: Personal Submersibles General Discussion 
Subject: Re: [PSUBS-MAILIST] gear set

Hank,  What about aluminum ? Brian

--- personal_submersibles at psubs.org wrote:

From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: James Frankland via Personal_Submersibles <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] gear set
Date: Tue, 24 Oct 2017 21:29:32 +0000 (UTC)

 Thanks' James will doHank
    On Tuesday, October 24, 2017, 6:26:22 AM MDT, James Frankland via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Have a look at hobbyking.  They are usually pretty good.

https://hobbyking.com/en_us/catalogsearch/result/?erp_category=&q=gears

On 24 October 2017 at 13:02, hank pronk via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:
> Thanks guys, but these people have tons of gears, but they are metal.  I am
> looking for plastic to keep the weight down.  I need to take a trip to the
> dump and look for a fax machine or something that has gears.
> Hank
>
> On Monday, October 23, 2017, 9:05:59 PM MDT, Alec Smyth via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hank, if what you're looking for is not an animal but has teeth nonetheless,
> these folks probably have it.
>
> http://www.bostongear.com
>
>
> Best,
> Alec
>
> On Mon, Oct 23, 2017 at 8:59 PM, hank pronk via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
>
> Hi All,
> I need ideas where I can find a plastic gear set for the wrist on my
> manipulator build.  I have the rotary actuator built and the gripper is well
> under way.  The way it works is, the rotary actuator shaft turns a shaft to
> open and close the fingers on the gripper (hand) The hand also free wheels
> on the same shaft so it can rotate 360 degrees continuously.  So I need a
> gear about 2 .5 inches in diameter and a matching gear about .5 inches or
> less  to drive the main gear.  The gear set will be driven by a second
> rotary actuator with a drive shaft enclosed in the arm member.
> Any leads would be great.
> Hank
>
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