mr_matt

My Feedback: (10)

Well I guess I got one of the overly hard pins in mine, it broke off clean (looks like a broken drill). I took the gear apart trying to change this pin, and it seems to be pressed into this bushing.

Anybody got any idea how to get this out? Like most modelers I do not have a press at home.

Thanks in advance,

seanreit

My Feedback: (60)

drill a hole the size of the pin in the wood in teh background of your picture.

Hold it against that hole, then use a scratch awl and beat it into submission till it comes through into the hole you drilled in the wood?

Just an idea

Gordon Mc

My Feedback: (11)

When you say you don't have a press - does that include a regular drill press ? Those can sometimes be used in place of a full press.

Any idea what the two different metals are ? Given the different thermal propreties of various metals, sometimes heating or freezing the part can help you remove a stuck part.

mr_matt

My Feedback: (10)

Good tip I tried that, with a torch on it to boot.

I can't believe it is on there this tight.

mr_matt

My Feedback: (10)

Good tip Gordon, I will go try the drill press

I am with you I do not know if the heating is helping or not

Gordon Mc

My Feedback: (11)

yup - that's why you may also want to try freezing it ... if the inner part is more temperature sensitive than the outer, then heating the assembly would make the fit even tighter, whereas popping it in the freezer for a wile would make it looser.

Kelly W

My Feedback: (2)

Matt,

I heated mine and it broke free pretty easily. Find some red (permanent strength) loctite for when you press the new pin in, in case the hole enlarges a bit from after removing the old pin or the new wire is slightly undersized.

how are the retract frames holding up?

Kelly

Nighthawk117

My Feedback: (41)

If you know anyone at a machine shop,they can drill it out with carbide or it can be EDM'ed out.

Gordon Mc

My Feedback: (11)

BTW, if this thing is just a press fit, then the hole may be tapered - in which case I kinda hesitate to state the obvious, but it can then only be pressed out in one direction.

FalconWings

My Feedback: (57)

Matt,

If it is Inconel or steel, propane torch and should slide out. If it is Aluminum, try a heat gun. I've hd problems like that before nd heat always seemd to be the answer.

If the metal gets red hot, slow quench it in oil, otherwise the sample may loose it's stiffness properties.

David

Topgun2mo

My Feedback: (45)

Matt, do you have a big bench vise? If you do you can rig some spacers from some washers and put a pin into a piece of metal to hold it straight. A socket may hold the part securely while providing relief for the pin to be pressed out.

mr_matt

My Feedback: (10)

Thanks guys,

I am going to try the arbor press over at JetCat

Regards,

Kelly W

My Feedback: (2)

Matt,

I really don't think you'll need to get it hot enough to worry about ruining the metallurgical properties. The outside material is brass, inside is steel. Its likely put together with a small amount of heat and a high-strength retaining compound. If you heat it up on a household iron at full temp, that should be about right to soften up the compound. Just hold the iron upside down and leave the pin and retainer sitting on it for a few min... You might feel significant resistance at first, just to break it free, but one it moves it'll be smooth and easy on a press.

I think you'll make things worse if you throw a torch level heat into it, or think about machining the pin out. Having done this same swap on my Stingray, just stick to moderate heat and a press.

Later'
Kelly

PS: Nice paint job, how's your Stingray fly? I think I've got my elevon servo issues sorted out on mine, ready to test it out on ~7kg of thrust next season!

Shaun Evans

Matt,

Put it in your oven at 350 for about 30 minutes. It'll fall out if you tap it with something at that point. Put your new one in while it's still hot and let it cool. Done it many times and it works.

mr_matt

My Feedback: (10)

Hi Shaun,

THanks for the tip. Sounds pretty tough to do at a jet rally. Can I get spare parts for these gear (side frames and the little brass busing, stuff like that?)

Hi Kelly,

It flies fine, the gear were bent on the first flight when I came up short. Second flight went fine. It needed less elevator expo, as the wings get heavy on elevator in the corners. I do not have a lot of experience with flying wings in any case.

Plane feels to me like a small scale plane, not only hot but heavy, fast approach, high sink.

Shaun Evans

Hi,

Matt, you won't have to do that at a jet rally. If you replace the pin, you'll be replacing it with music wire, right? It won't be a purpose-designed shear-pin like what was in there. I used 3/16th music wire after mine sheared off (ran it up onto a curb taxi-testing in the cul-de-sac). All the gear parts are available.