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.010 + .020 Reset Tools

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.010 + .020 Reset Tools

Old 02-12-2008, 10:05 AM
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on pipe
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Default .010 + .020 Reset Tools

I made a reset tool for .049's with Bruce Matthews spec sheet. Does anyone have plans for the .010 and the .020? I would rather make my own if I can find measurements. I have seen the .020 tool for sale at Select Hobbies, but the .010 is not available from them.
Does anyone know where the .010 tool can be bought if no one has plans? Thanks in advance... Ross
Old 02-12-2008, 12:51 PM
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Default RE: .010 + .020 Reset Tools

To the best of my knowledge, Cox never produced a reset tool for the 010, nor did Kustom Kraftsmanship, who were the biggest producer of aftermarket Cox accessories. If there are any out there they are certain to be individual efforts. Your best option is to get in touch with Jon Fletcher in Australia ('Aeroland' on Ebay) who may be prepared to make you one. I think he's listed an 010 tool on Ebay in the past

'ffkiwi'
Old 02-12-2008, 01:49 PM
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Default RE: .010 + .020 Reset Tools

I did a tool for the .020 as well. Let me get the sizes off it and post later tonight.
Old 02-12-2008, 05:46 PM
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Default RE: .010 + .020 Reset Tools

I think I will have some more next month... My Machinist is in HI. for a couple of weeks.
Old 02-12-2008, 10:49 PM
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Default RE: .010 + .020 Reset Tools

Bruce, If you have that info somewhere, I would be forever greatful... ffkiwi and skaliwag, if Bruce can't find those plans I will follow up on your suggestions. In fact, as big as these engines are, I might WANT to buy the tools. My machining skills are about an 8 out of 10, and the .010 tool is probably pretty small. Anyway, thanks for your help. Ross
Old 02-13-2008, 12:05 AM
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ptulmer
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Default RE: .010 + .020 Reset Tools

on pipe, as someone who recently tried to make an .010 size reset tool I can make a few suggestions. First, a slitting saw and mill look to be a must have. My hands and a cutoff wheel aren't steady enough for the slot. (steady hands may vary...) The other problem I've had is the anvil. Showering may have solved another problem.(strange how that works) It occurred to me that the anvil could be made in two pieces like this. (It may have been what was suggested by ProBroJoe, but I didn't understand. It also may be the way Skaliwag's are made.) Turn the base with a pedestal slightly larger than the piston and then make a tube with an OD of the base and an ID of the pedestal, tall enough to contain the piston. If you do make one, I'd be interested in any problems you solve! Once some shop time comes available I'll be back at the Smithy trying it again.
Old 02-13-2008, 07:10 AM
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Default RE: .010 + .020 Reset Tools

On pipe

I think I can help I purchased an .010 reset tool some years ago but only recently had occasion to use it, (but had a problem).

It is made from ¼ hex stock, overall length approx 2.2â€. It is bored 0.330 deep with a No. 50 drill. The slot is 0.330 long and has been cut with a 0.060 end mill. The face is conical and appears to be approx 90 deg; however I suspect your favorite countersink or center drill would do just fine. The OD of the cylindrical machined portion is 0.190. (The ID of the piston is approx 0.202). The length of the 0.190 section SHOULD be 0.550 minimum. (Mine measures only 0.425 which caused my problem, see photo).

The anvil is basically a piece of 5/8 steel rod X 3/8 long. It is bored 0.254 by 0.242 deep. The bottom of the bore is not flat but rather has a raised cylindrical ‘donut’ (see photo) which I suspect is required to properly support the piston to prevent distortion.

Hope this helps,
Al

PS. My tool didn’t have the 0.190 cylindrical section cut back far enough and that allowed the rod to contact the hex section which caused the first ‘whack’ to split the piston. A goof by the machinist for sure, but still my own fault for not watching what I was doing.
al

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Old 02-13-2008, 08:43 AM
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Default RE: .010 + .020 Reset Tools

I would second ffkiwi's advice to purchase one from Jon Fletcher.
They are very nicely finished, they work, and they are inexpensive.
Personally, I would rather spend my shop/machining time fabricating bits which are not commercially available - but then again, some guys just like to make chips
Old 02-13-2008, 10:53 AM
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Default RE: .010 + .020 Reset Tools

I recently received an .010 reset tool under the "pennies from heaven" program, and aside from the T&E aspect of it, I wouldn't make one. Sure, I *can* make one, but I look at the time needed to make the tooling to do the job and what my time is worth-not to mention scrapping a few irreplaceble pistons.

Viva-La aeromdelling friendships!
Old 02-13-2008, 01:44 PM
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Default RE: .010 + .020 Reset Tools

I've never used anything for the anvil other than a smoothly machined slug of metal bar. I've never had an issue with the piston skittering around on me either. Not sure why the anvil would even need that hole and when you add in the difficulty of making the bottom flat or near to flat it's just not worth it.
Old 02-13-2008, 03:16 PM
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Default RE: .010 + .020 Reset Tools

I think the donut shape in the bottom of the anvil is only from a manufacturing point of view?
It's hard to get a flat surface in the center when you use a lathe, so if you simply remove the center part it is much easier to produce.
Given the tiny size of the piston here, this then becomes a donut shape rather than a tiny hole/indentation...
Old 02-13-2008, 03:36 PM
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Default RE: .010 + .020 Reset Tools

probably has to do more with the fact that the face of the piston it's flat and the diameter of the recess in the anvil is the same as that for the ball seat in the piston.
Old 02-15-2008, 02:50 AM
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Default RE: .010 + .020 Reset Tools

OK, it's two days later but here's the measurements for the .020 tool

Fabricate from a 2 inch length of 0.25 rod
Nose diameter to fit into the piston skirt is 0.240 and this extends up 0.5 to 0.6 inches
Slot is 0.080 wide by just over 1/2 inch long. On mine I found that I needed to file a slight recess with a 1/4 inch round file at the point where the big end sat to ensure that it didn't get pushed on. Watch for that.
It's hard to tell now but I think I used a #2 center drill for this one. But I'm seeing signs of a slightly larger drill portion after the taper. So it may have been a #3.

Link to center drill size chart....
http://www.i-logic.com/utilities/CenterDrills.htm
Old 02-15-2008, 03:22 PM
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Default RE: .010 + .020 Reset Tools

Al and Bruce, Thanks for the dimensions on those tools. I will attempt to make these next week. Like I said, I would prefer to make them, but if I'm not satisfied with my "old world" craftsmanship after I'm done, I might buy a "factory" unit. Thanks Everybody! Ross
Old 02-16-2008, 09:05 AM
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Default RE: .010 + .020 Reset Tools

Bruce... You posted the specsw for the .020 reset tool, and Big Al posted the specs for the .010 reset tool.... perhaps both these should be put in the Cox FAQ.....?
Old 02-16-2008, 12:53 PM
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Default RE: .010 + .020 Reset Tools

Good idea. I'll add quotes to the post about the 049 one so they are all in one handy spot.

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