Need shaft for Turnigy 2836 2350kv

[dondi]

I have a couple of Turnigy 2836 2350kv motors both with broken shafts.
http://www.hobbyking.com/hobbyking/s...idproduct=7993

I couldn't find a shaft (Hobby King) explicitly for that motor but perhaps I missed it.

The shaft is 4mm by about 55mm.

There is a 4mm shaft for an Turnigy AerodriveXP 28-36 SK listed. Would that work?
http://http://www.hobbyking.com/hobb...idproduct=8961

Thanks!
Don.

[CHELLIE]

Originally Posted by dondi

I have a couple of Turnigy 2836 2350kv motors both with broken shafts.
http://www.hobbyking.com/hobbyking/s...idproduct=7993

I couldn't find a shaft (Hobby King) explicitly for that motor but perhaps I missed it.

The shaft is 4mm by about 55mm.

There is a 4mm shaft for an Turnigy AerodriveXP 28-36 SK listed. Would that work?
http://http://www.hobbyking.com/hobb...idproduct=8961

Thanks!
Don.

Hi Don both the 2836-2350 turnigy motor and the SK 2836 turnigy motors show using a 4mm X 55mm shaft, Sooo I think it should work hope that helps, Chellie

[dondi]

Thanks Chellie, I'll order a couple and see how they work out.

[payne9999]

I am very frustrated with motor suppliers that can't keep stock on replacement shafts etc. I have taken to ordering hardened steel shafts from McMaster Carr and cutting them with a Dremel cutoff grinding tool. They can also be slotted (for retainer clips) and have flat spots added for set screws with the same tool.

It works great but remember quite often the shaft is not bent but the prop adapter (soft aluminum) is often tweaked. Prop adapters are tricky to straighten but with some practice (a little trial and error) it can be done.

Also prop adapters are readily available unlike specific replacement shafts. It would be nice if the motor makers would standardize!

Dave

[dondi]

Hi Dave,

Yeah, once I took the old shaft out I could see that there wasn't much going on there. Just a smooth 4mm shaft with a small flat at one end.
No retainer clip groove. I guess they feel that depending upon the grub screw is sufficient for retainment, eh?

I might grab the raw materials from McMasterCarr and roll my own just for fun.

Could you provide a link to the exact item you ordered?

Thanks,
Don.

[payne9999]

On McMasters site if you search on "steel rod" you will get to choose metric or inch. They offer several good tool steel alloys. Here is an example of some "tool steel" rod:

http://www.mcmaster.com/#steel-discs/=du72xa

I am an engineer but I don't recognize most of these alloys but if they are precision ground and hardened for use in tooling they will be quite good for motor shafts. $8.57 for 36" is a pretty reasonable cost and you can make a lot of motor shafts from that. The link is to .156" diameter which works out to just a few thousands under 4mm, a common size. .125" or 1/8" is also very common which would be 3.175mm.

Dave

[kyleservicetech]

Originally Posted by dondi

I have a couple of Turnigy 2836 2350kv motors both with broken shafts.
http://www.hobbyking.com/hobbyking/s...idproduct=7993

I couldn't find a shaft (Hobby King) explicitly for that motor but perhaps I missed it.

The shaft is 4mm by about 55mm.

There is a 4mm shaft for an Turnigy AerodriveXP 28-36 SK listed. Would that work?
http://http://www.hobbyking.com/hobb...idproduct=8961

Thanks!
Don.

If you're after just about any type of metal, this place can furnish it:
http://www.speedymetals.com/ They stock drill rod in both english and metric sizes.

Nice thing about speedymetals is they also include a bit of information on each type of metal they stock.
(Example http://www.speedymetals.com/information/material71.html)
4 mm drill rod http://www.speedymetals.com/pc-3399-...drill-rod.aspx

Several years ago I purchased a two foot long piece of 3 inch by 8 inch steel tubing, an 18 inch long piece of 3 inch by 5 inch tubing, and a piece of 1 1/2 inch square steel bar stock a foot long from Speedy Metals. The tubing had a 3/8 inch wall thickness. They cut it from their stock.
This steel stock was used to convert a Sherline Lathe to a permanent milling machine with a large X-Y table.

Or how about a piece of steel rod 12 inches in diameter?
http://www.speedymetals.com/pc-705-8...shed-1018.aspx

They are located just West of Milwaukee WI, so picked it up locally. They have no cut charges and no minimum order. My son indicates their price is higher than some places, but for just a small order, they are pretty close.

[payne9999]

I think the rod you point to would be fine for a motor shaft but it as well as drill rod are possibly a little soft where a tool steel dowel pin would probably be a little more durable. A lot of times you can look at the "formability" rating because if it is quite form-able, you can assume it will bend easier.

Of course the harder the steel is the more difficult it is to cut but I think a cut-off wheel will still handle tool steel.

Again, I have really noticed that most times I thought I had a bent shaft it was really the prop adapter. Fortunately I have not bent a shaft for a while since I have been practicing this year many, many hours. It is annoying when it happens though.

Dave

[kyleservicetech]

Originally Posted by payne9999

I think the rod you point to would be fine for a motor shaft but it as well as drill rod are possibly a little soft where a tool steel dowel pin would probably be a little more durable. A lot of times you can look at the "formability" rating because if it is quite form-able, you can assume it will bend easier.

Of course the harder the steel is the more difficult it is to cut but I think a cut-off wheel will still handle tool steel.

Dave

That's probably why they also include how to harden this stuff. But for $6 you get enough material to make a real hand full of shafts.

As for cutting this stuff, or any steel based material, I've put one of those Skill Saw cut off disks into my bench grinder. THAT, will cut anything made out of steel or iron based materials.

[dondi]

Thanks for all the feedback guys, I appreciate it.
Don.

[payne9999]

Originally Posted by kyleservicetech

That's probably why they also include how to harden this stuff. But for $6 you get enough material to make a real hand full of shafts.

As for cutting this stuff, or any steel based material, I've put one of those Skill Saw cut off disks into my bench grinder. THAT, will cut anything made out of steel or iron based materials.

Kyle,

I need to correct my post: The McMaster materials are listed as air hardened or oil hardened but all the materials they sell come in an annealed condition. I don't know why they list the type of hardening if they really come in an annealed condition, unless they are trying to tell us how the material would be hardened after machining. However, this means the material from Speedy Metals is probably about the same. It is fairly easy to harden a shaft in the garage with a torch but it may not be that critical for a these small shafts. Picking the best alloy might be more important. I know some people just use good quality music wire (K&S) like what is stocked in most hobby shops.

Dave

[kyleservicetech]

Originally Posted by payne9999

Kyle,

I need to correct my post: The McMaster materials are listed as air hardened or oil hardened but all the materials they sell come in an annealed condition. I don't know why they list the type of hardening if they really come in an annealed condition, unless they are trying to tell us how the material would be hardened after machining. However, this means the material from Speedy Metals is probably about the same. It is fairly easy to harden a shaft in the garage with a torch but it may not be that critical for a these small shafts. Picking the best alloy might be more important. I know some people just use good quality music wire (K&S) like what is stocked in most hobby shops.

Dave

Thanks for the input. As for those dowel pins, I know they are very hard stuff, but only came in lengths of an inch or three. Near as I can tell they were used to precisely locate machining tools prior to doing the machine work on the item.

DennyV