RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (Full Version)

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Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (5/16/2008 5:57:19 PM)

snurckle... I have a different sum. I checked, double checked and triple checked.

Everything, minus stuff from Soloprop, minus shipping:
- 1, rear hub half , $87.60 (USD)
- 1, front hub half, $87.60 (USD)
- 1, actuator, $40 (CAD)
- 12, 6-32 x 3/8" SHCS, $2.78 (CAD)
- 1, 1-1/4" Tru-Turn hub, $17 from me (CAD)
- 1, 8-32 SHCS, $0
Total: $234.98

I say we make $1 USD = $1 CAD to make things simpler.

I will be sending each of you a bill in a couple days. Those who wish to pre-pay, or put down a deposit, are welcome to do so (my bank account will thank you).

Josh



Joe Lott -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (5/16/2008 7:19:35 PM)

PM sent!



snurckle -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (5/16/2008 7:54:36 PM)


quote:

ORIGINAL: Juice

snurckle... I have a different sum. I checked, double checked and triple checked.

Everything, minus stuff from Soloprop, minus shipping:
- 1, rear hub half , $87.60 (USD)
- 1, front hub half, $87.60 (USD)
- 1, actuator, $40 (CAD)
- 12, 6-32 x 3/8" SHCS, $2.78 (CAD)
- 1, 1-1/4" Tru-Turn hub, $17 from me (CAD)
- 1, 8-32 SHCS, $0
Total: $234.98

I say we make $1 USD = $1 CAD to make things simpler.

I will be sending each of you a bill in a couple days. Those who wish to pre-pay, or put down a deposit, are welcome to do so (my bank account will thank you).

Josh

You put :
12, 6-32x3/8" SHCS, $2.78

I understood that as....12x2.78

I see the error, and I miscalculated.



Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (5/21/2008 10:58:29 PM)

Soloprops needs 2 to 3 weeks of lead time to have your props ready to ship. This also happens to be the lead time given to me my the CNC shop. It would be nice if the two shipments arrive at the same time.

So Carl (from Soloprops) and I are setting a cutoff date on Sunday, May 26, 2008 to place your orders for props and the extension nut/washer.

If you place your Soloprop order on or before the cut-off date, you shipment will be combined with the rest to save a little money on shipping. Your Soloprop order will be re-packed with my hub and shipped together to your door. One shipping charge.

If you place your Soloprop order after the cut-off date, it's not the end of the world. Carl with ship your order directly to you. The hub will be in another shipment. Two shipping charges.

I know several of you have already placed your order with Soloprop. Carl says he really appreciates the early notice.

Josh



Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (5/30/2008 12:39:19 AM)

Hello all,

It's been a week since the last post and I just want to give an update on the state of things here.

The production of the hubs has been delayed. The reason is mainly because of my own lack of experinece with CNC and machining parts in general.

The design changes I made to the prototype design are due to manufacturing tolerances and the fit of all the other components that comes in contact with the hub. On the prototype, it was a tight fit when the prop blades were sandwiched between the hub halves. It's a little looser fit on the Soloprop hubs. So for the production design, I increased (only by a hair) the diameter of the interior surface of the hub (the surfaces holding the prop blades) and I specified a tighter tolerance. Apparently, this change required the CNC shop to order a new set of custom made guages, and this is what is causing the delays. Had I known it would cause delays, I would not have made that change. A tight fit on the props is not a bad thing.

Anyways, it's too late to change the design again so we have to live with the delay. The CNC shop owner says everything else is okay and ready (including a tripod and camera to film the machining of one part).

Josh



snurckle -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (5/30/2008 1:30:41 AM)

Juice - sounds good...take your time, I'm in no hurry...I figure - as long as I have it by September...I'm happy.



p-40_lova -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/4/2008 7:53:39 PM)

Juice,

Looks fantastic!
I have an RCV 120 sp with a zinger 3 blade. The hub is flat aluminum. With the high torque of the RCV, I have a hard time keeping the prop/prob hub and spinner from shifting. I've used drywall sandpaper, cut into washers, to mesh between the connections and that seemed to help a bit but I still have the problem. I was wondering if you have any issues like this seeing your hub is smooth aluminum and its connecting to the semi-smooth aluminum surface of the RCV.
I'm looking into using carbon steel interior/exterior teeth combo lock washers.


Thanks!

Doug



Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/4/2008 8:48:33 PM)

Hi Doug,

That concerned me during the design phase. The design is based heavily on the Soloprop hub design, including the smooth aluminum surface in contact with the engine's drive plate. I haven't read any of this issue with Soloprop, so I thought it should be okay. As it turns out, in the actual test runs and test flight, it was not an issue.

The extension bolt (from Soloprop) is made from plated steel and is very heafty. It's purpose is to tighten down the entire hub/prop assembly against the engine's drive plate. It is tighted with a torque wrench set to 15 lb-ft (specified by Soloprop). When it's that tight, nothing is going nowhere.

The extension bolt are shown on the top left of the attached photo (one full length from Soloprop, one cut down to fit the hub).

I hope this helps.

Josh



p-40_lova -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/4/2008 9:25:57 PM)

Hey Josh,

Glad to hear you don't have that issue. It doesnt help that Im sandwiching multiple layers either (hub and spinner).

Thanks for the replay and keep us updated!

Doug



Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/6/2008 12:48:30 AM)

Another week has gone by and it's time for an update...

- The CNC shop says the raw aluminum for the front and rear hub halves have been cut to size. He'll start machining them today or tommorow.

- I was in the area of the local machinist who is making the actuators, so I stopped for a visit to see how it's going. I snapped a picture of his progress with the actuators (with a crappy cell phone camera). On the front right is the prototype actuator, which he is using as reference to machine the others (which are still round at this stage). On the front left is one with the tap still in it.

- A few people have stepped up and voluntarily put down a deposit on their hub. They pre-paid for everything, minus the final shipping costs (which is still unknown). I've already paid the up-front costs for 15 hubs, but my credit card is a little bloated. I was prepared to pay the up-front costs for the origina 5 hub orders. I will have to perform some financial juggling for 15 hubs (which isn't a problem, but I would prefer to minimize it). Are there any other people willing to put down a deposit for their hub? If so, send me a Private Message. It would be very greatly appreciated.

Josh



tony-howard -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/10/2008 7:04:49 PM)

Hi Josh

How many flights do you have on the hub? Everything still OK?



Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/10/2008 9:52:24 PM)

Tony,

Still just one flight. You're probably wondering about MTBF (mean time between failure), right?

I would have liked to fly it more, but there are a few unrelated things that have prevented me from doing more test flights (in order of importance):

1) The mechanical rotating landing gear from H9... Remember the landing of that test flight? The hub/props are too expensive for that to happen again on an unreliable set of retracts. I have ordered and am waiting for the new set of LADO electric retracts to come in. From what I've read, they've already started shipping, so hopefully I'll have a new set of reliable landing gears soon.

2) The actuator... The one and only actuator prototype is at the machinists shop. It's very easy to get the cuts and orientation wrong, so the machinist want to prototype as a reference as he's machining all the others. He should be finished this week, so I'll have my actuator back soon.

3) The weather has been aweful. This is the worst summer since I started flying RC. Mainly it's been abnormally cold and windy to even think of flying. Real summer weather is actually here now, finally. So this excuse doesn't apply anymore. =)

4) The lease of my club's field expired. That's normally not a problem, in previous years we just sign a new lease. But this year, the landowner sold the property without telling us. And the new landowners don't want us to fly until a completely new lease is in place. They don't seem to be in a rush to get it done, as a result our club has been field-less for about a month now. If not for the bad weather, our club members would have rioted long ago. Our alternative is to fly as guests at neighboring clubs fields.

I'm confident the hub will perform well. I have run the engine again after that test flight (with one nose-over and a hard flip-over landing) and there is no sign of anything failing. I'll make sure to give detailed flight reports... when all the above issues are resolved (soon).

Josh



snurckle -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/10/2008 10:59:41 PM)

Juice-
Any chance you could send invoices via paypal? I know it's possible, and fairly simple to do. Also, gives you an easy way to track who has paid, and who hasn't. Not sure if we can make partial payments vice full payments, but probably something to look in to.

Let's face it - it's not that I don't trust you, but the buyer and seller protection offered through Paypal is something one should take advantage of, given the opportunity. If I just make a payment to you, there is nothing for paypal to bounce that off of as an agreement between parties. If you send invoices out, which is a bill listing parts promised, then paypal should protect it based on an agreement between buyer and seller.

Think about it, and I've sent you a PM with my email address in it, so you can add it to the block on the invoice in paypal.

Thanks
john



Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/10/2008 11:16:28 PM)

John,

Good idea. I'll give it a try tonight when I get home from work.

Josh



HellcatAce -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/12/2008 9:59:27 PM)

Hey Josh, sent you a PM. I also ordered those retracts from Lado. I talked to Doug last week and said he's getting them shipped for orders placed last month, so I should have a chance to test them on my F4U pretty soon. Gotta love the scale speed on those babies!



Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/14/2008 3:06:34 PM)

I'm sorry to report that there are more delays with at the CNC shop.

The town of Paradise, CA, where the CNC shop is located, is in a state of emergency and has been evacuated due to the close proximity of a massive fire. Here is one news report:
Thousands in Chico forced to evacuate

At the time of evacuation, one side of the first two hub halves have been milled. They are still sitting in the mill waiting to be flipped over to mill the other side. Needless to say, the shop owner has more important things to deal with right now. He will get in touch with me as soon as everything settles down. I'll update the thread when I hear back from him.

Josh



grinder-RCU -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/16/2008 5:26:14 AM)

Well on a lighter note. I took out my H9 Corsair and found out the CG was way off after a stab fix. High wind conditons, turn downwind inside wing stalled, and a messed up cg and that was all she wrote. But will buy another fuse and wing and rebuild since i have all of the gear which survived. The RCV 90 was unhurt. Good thing I didn't have Josh's hub on there and and new soloprop. So this delay will give time to rebuild.

Grinder.



Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/17/2008 6:03:40 AM)

Grinder: I'm sorry to hear about your crash. Hopefully, the hub will be ready for your next one.

Update: Despite the delay to the CNC'ed hub halves, today was a very exciting day...

Pic #1. I picked up the Tru-Turn hubs from the hobby shop. I had to open up the packages to have the holes in the backing plate enlarged to 13mm. In this picture the holes are already enlarged (lower right). These will now go back in the bag and I'll staple it up again.

Pic #2. I picked up all the actuators from the local machinist.

Pic #3. A picture of all the 6-32 bolts (12 for each hub).

Except for the hub halves, that's everything else that I'll be supplying.

Josh



Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/18/2008 3:02:32 PM)

I got an e-mail from the CNC shop. It has one word and one picture...

quote:

Progress.

Translation:
"Let me show you what I've done so far (so you don't freak out), but I can't write a wordy e-mail at this time becuase I need to get back to work."

This is what I see:

- Interior surfaces of 5 back halves, DONE.
- Blocks cut to size for another 8 back halves.

- Interior surfaces of 5 front halves, DONE.
- Blocks cut to size for another 8 front halves.

That's 13 of each part accounted for. My quess is that the unaccounted 14th front and back hub halves are in his machine at that time getting their interior surface cut (his machine does 2 at a time).

Juice



saramos -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/18/2008 11:13:26 PM)

Sweet!!

Glad to see he made it through the fires.

Scott



Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/24/2008 12:29:41 AM)

Another update picture. This is what I see...

- On the left side of picture #1, there are 4 stacks of 3 rear hub halves, plus 2 more sitting just right of the stacks. That's all 14 rear hub halves with the interior surface done. At least one of those (the one closest to the center of the picture) has the center part extruded and is ready to have the exterior surface milled.

- On the right side of picture #1, there are 2 rows of 6 front hub halves completely done (interior and exterior surfaces). Sitting just left of them are two more with only the interior surface done.

- Picture #2 is a close-up of all 14 front hub halves.

I think he's made good progress last week. He said he should be done the job by the end of day tommorow.

Josh



Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/24/2008 1:27:48 AM)

There are more pictures. This sequence of pictures show the steps involved in CNC'ing this hub.

Pic #1:
Step 1. The interior surface is milled from a block of Aluminum. All of this is done non-stop in one step.

Pic #2 & 3:
Step 2. Flip over and bolt down. There are pins on the base that goes into the bolt holes drilled in step 1. This aligns the piece properly. Two temporary clamps holds the pice down for the next step.

Pic #4:
Step 3. Mill the center face of the hub half and drill the center bolt hole. Bolt the piece down using the newly drilled center bolt hole. The two temporary clamps are removed.

Pic #5 & 6:
Step 4. Rough cut the exterior surface.

Pic #7:
Step 5. Finish cut the exterior surface. On the front hub halves, counter-bore the 12 bolt holes and also done in this step.

Here are some videos of various stages of the process...
Video #1: Tool change and counter-bore
Video #2: Finishing
Video #3: Finishing 2
Video #4: Finishing 3

And finally, Here's the CNC shop's Photobucket web page...
http://s207.photobucket.com/albums/bb180/matt_rfr/










Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/26/2008 3:21:00 PM)

Another update...

The CNC machining of all the hubs were completed on time (Tue 6/24). These were the last things that needed to be fabricated. UPS picked up the package containing all 14 hubs yesterday (Wed 6/25) to deliver them from California, where the CNC shop is, to Toronto, Canada, where I am. It's scheduled to arrive late next week. When they arrive, I will do a quick quality control check on the hubs, then I'll ship them out to all the paid participants.

Josh



grinder-RCU -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/26/2008 11:23:06 PM)


quote:

ORIGINAL: Juice

Another update...

The CNC machining of all the hubs were completed on time (Tue 6/24). These were the last things that needed to be fabricated. UPS picked up the package containing all 14 hubs yesterday (Wed 6/25) to deliver them from California, where the CNC shop is, to Toronto, Canada, where I am. It's scheduled to arrive late next week. When they arrive, I will do a quick quality control check on the hubs, then I'll ship them out to all the paid participants.

Josh


Sweet!.



Corsair Blues -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (6/29/2008 3:15:03 PM)

Josh,

I just came across this thread early this morning and was floored at how you moved things along so quickly, unlike to many other great ideas that drag on and just fizzle out and never get finished.
In post#174 you mentioned that you ordered one extra hub set to get to the next discount level. Is this last hub spoken for? If not, I would like join to this squadron and claim #15. Believe me when I say if had known of this earlier I would have been in from the beginning.

BTW you have my greatest respect and admiration for spearheading and completing this most impressive project.

Allan



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