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Got a new prop balancer... and new questions
Page 1 of 1
Got a new prop balancer... and new questions
I got this at my LHS today:
http://www.ebay.com/itm/Top-Flite-Power-Point-Prop-Balancer-TOPQ5700-/160736125326?pt=Radio_Control_Parts_Accessories&hash=item256c9ea18e
It is a magnetically suspended balancing shaft and should be pretty accurate. That's assuming the cones are balanced, and they appear to be. Besides, the small hole in 1/2A props fits tightly without the cones. I do use one because the Cox props have a wide hole on the rear side of the hub. I have tried with and without, and nothing about my upcoming questions changes.
I had a bag of props balanced with my home made balancer last week, so I started checking those. Most of them will hang perfectly level horizontally, but only on one side of the hub. Given any opportunity it will always flip over so the same side of the hub is on the bottom, with the blades still perfectly horizontal. This tells me the blades are balanced, but the hub is either drilled off-center or heavier on one side(I bet I can guess which). It should park at any angle, either where I place it, or when it finishes spinning on its own. The instructions say never to remove material from a hub, but to counter balance it by adding weight. This is a safety precaution. But I'm not balancing TF wooden props, I'm balancing the toughest freakin stuff ever molded into a propeller.
Any thoughts on taking one to the drill press and just punching the point of a small bit(not the body) into a Cox hub to balance it? It makes a nice clean cone shaped divot. I botched one, by drilling a small hole, and then another and another. I threw it away. Damn, it was a brand new 6x3 too. My next one came out perfectly after making one tiny divot. It will park any place I stop its rotation on the balance shaft. If a prop needs more material removed, I want to use the point of the next size larger bit, rather than making more divots. But I haven't done that yet, I figured I should stop and ask first.
I don't think tape is going to stick on a hub. Nor is CA glue or anything else I try to adhere to it. What thoughts, oh brilliant forum members, do you have to offer a novice prop balancing friend, whom y'all already know takes things to extreme details.
Thanks,
Rusty
http://www.ebay.com/itm/Top-Flite-Power-Point-Prop-Balancer-TOPQ5700-/160736125326?pt=Radio_Control_Parts_Accessories&hash=item256c9ea18e
It is a magnetically suspended balancing shaft and should be pretty accurate. That's assuming the cones are balanced, and they appear to be. Besides, the small hole in 1/2A props fits tightly without the cones. I do use one because the Cox props have a wide hole on the rear side of the hub. I have tried with and without, and nothing about my upcoming questions changes.
I had a bag of props balanced with my home made balancer last week, so I started checking those. Most of them will hang perfectly level horizontally, but only on one side of the hub. Given any opportunity it will always flip over so the same side of the hub is on the bottom, with the blades still perfectly horizontal. This tells me the blades are balanced, but the hub is either drilled off-center or heavier on one side(I bet I can guess which). It should park at any angle, either where I place it, or when it finishes spinning on its own. The instructions say never to remove material from a hub, but to counter balance it by adding weight. This is a safety precaution. But I'm not balancing TF wooden props, I'm balancing the toughest freakin stuff ever molded into a propeller.
Any thoughts on taking one to the drill press and just punching the point of a small bit(not the body) into a Cox hub to balance it? It makes a nice clean cone shaped divot. I botched one, by drilling a small hole, and then another and another. I threw it away. Damn, it was a brand new 6x3 too. My next one came out perfectly after making one tiny divot. It will park any place I stop its rotation on the balance shaft. If a prop needs more material removed, I want to use the point of the next size larger bit, rather than making more divots. But I haven't done that yet, I figured I should stop and ask first.
I don't think tape is going to stick on a hub. Nor is CA glue or anything else I try to adhere to it. What thoughts, oh brilliant forum members, do you have to offer a novice prop balancing friend, whom y'all already know takes things to extreme details.
Thanks,
Rusty
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: Got a new prop balancer... and new questions
CA sticks like nobody's business to my cox props. Are your props oily?
Cribbs74- Moderator
Posts : 11906
Join date : 2011-10-24
Age : 50
Location : Tuttle, OK
Re: Got a new prop balancer... and new questions
No, I just assumed it might not stick, I could be wrong, since you've done it successfully. Plus it takes a lot of weight to balance a hub as opposed to way out near the end of a blade. I could mix it with some metal filings to add weight. That could be dangerous too though.
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: Got a new prop balancer... and new questions
RknRusty wrote:No, I just assumed it might not stick, I could be wrong, since you've done it successfully. Plus it takes a lot of weight to balance a hub as opposed to way out near the end of a blade. I could mix it with some metal filings to add weight. That could be dangerous too though.
Bondo? JB weld? Or maybe you could scuff it an use 2 part epoxy.
Cribbs74- Moderator
Posts : 11906
Join date : 2011-10-24
Age : 50
Location : Tuttle, OK
Re: Got a new prop balancer... and new questions
Yeah, both of those are pretty heavy. I'll let you know whatever I figure out.
I never worried about it too much before, but the other day before I made that Black Widow video, I tried a 5x3 out of my field box on it, and it wouldn't even turn 17.5k. Then I put that Topflite 5.25x4 on it and it screamed. And that day I made the video of it flying, it ran like crap.That must have been the prop too.
I never worried about it too much before, but the other day before I made that Black Widow video, I tried a 5x3 out of my field box on it, and it wouldn't even turn 17.5k. Then I put that Topflite 5.25x4 on it and it screamed. And that day I made the video of it flying, it ran like crap.That must have been the prop too.
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: Got a new prop balancer... and new questions
Cyano will stick to it like, well glue
Rusty.
However...
Cox props and acuarately dilled hubs are not (inmho) really two things that are synonymous in my limited experience.
There are some new props 'out there' which are simply humourous in this respect.
I've only found props from those awful Germans (Graupner) that are any good balancing straight from the pack BUT
you've still the the hub hole to contend with.
![Very Happy](https://2img.net/i/fa/i/smiles/icon_biggrin.png)
However...
Cox props and acuarately dilled hubs are not (inmho) really two things that are synonymous in my limited experience.
There are some new props 'out there' which are simply humourous in this respect.
I've only found props from those awful Germans (Graupner) that are any good balancing straight from the pack BUT
you've still the the hub hole to contend with.
![Very Happy](https://2img.net/i/fa/i/smiles/icon_biggrin.png)
John Goddard- Diamond Member
- Posts : 2447
Join date : 2011-11-24
Age : 59
Location : Leyton North East London
Re: Got a new prop balancer... and new questions
I know many here shun APC props but I have had really good luck with them. I have even had good luck shortenng them. I have never checked to see if the blades or the hub were out of balance when balancing them. I take the lazy way and just sand the blade tips. If you think that sounds bad you should see how most aluminum props are dressed on full size aircraft.
fit90- Diamond Member
- Posts : 1337
Join date : 2011-08-11
Location : Naples, Florida
Re: Got a new prop balancer... and new questions
Sorry Bob I think APC are fine but sometimes need a little help.
But the Graupners are (through gritted teeth) always spot on.
But the Graupners are (through gritted teeth) always spot on.
John Goddard- Diamond Member
- Posts : 2447
Join date : 2011-11-24
Age : 59
Location : Leyton North East London
Re: Got a new prop balancer... and new questions
John Goddard wrote:Sorry Bob I think APC are fine but sometimes need a little help.
But the Graupners are (through gritted teeth) always spot on.
vorsprung durch technik!
![Very Happy](https://2img.net/i/fa/i/smiles/icon_biggrin.png)
Ivanhoe- Diamond Member
- Posts : 1752
Join date : 2011-09-30
Location : Northern Ireland
Re: Got a new prop balancer... and new questions
I'm cross posting this at RCG.
Since I tried working on some more Cox props, the drill turns out to be a bad idea. So I answered that question myself.
Plan B. I also have a table top belt sander, so I tried sanding off some material on the heavy side of the hubs. I did it on old ones I can toss if I botch it. I'm surprised at how much plastic has to come off. Trying to keep the curve neat, but it's obvious where it's been ground down. But they will finally balance before I get down to the drive plate and spinner facings. I'm going to go with this. As tough as the rubber duckies are, I don't think they are in danger of self destructing.
I have some old Windsor props, I see on their site, that's the same as MA props I've heard about. They were almost perfect right off the bat. I think I'll get some of those. They look more brittle, so I'll be more careful with them, but their shape lends to easy cutting down.
So if I don't get a blade through my eye and out the back of my head, I'll come back to see any warnings or advice that might pop up.
Since I tried working on some more Cox props, the drill turns out to be a bad idea. So I answered that question myself.
Plan B. I also have a table top belt sander, so I tried sanding off some material on the heavy side of the hubs. I did it on old ones I can toss if I botch it. I'm surprised at how much plastic has to come off. Trying to keep the curve neat, but it's obvious where it's been ground down. But they will finally balance before I get down to the drive plate and spinner facings. I'm going to go with this. As tough as the rubber duckies are, I don't think they are in danger of self destructing.
I have some old Windsor props, I see on their site, that's the same as MA props I've heard about. They were almost perfect right off the bat. I think I'll get some of those. They look more brittle, so I'll be more careful with them, but their shape lends to easy cutting down.
So if I don't get a blade through my eye and out the back of my head, I'll come back to see any warnings or advice that might pop up.
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: Got a new prop balancer... and new questions
Personally, i wouldn't drill or grind on that hub area at all. Alot of load on that little area. Like you posted, you might have a time bomb just waiting for the most inopportune time. One little unseen nick creating a stress fracture and you might loose model and engine.
Just my .051 cents.
Just my .051 cents.
PV Pilot- High Tech Balsa Basher
- Posts : 1854
Join date : 2011-08-11
Age : 57
Location : The ragged end of the Universe.
Re: Got a new prop balancer... and new questions
Is that 2 cents adjusted for inflation?PV Pilot wrote:Personally, i wouldn't drill or grind on that hub area at all. Alot of load on that little area. Like you posted, you might have a time bomb just waiting for the most inopportune time. One little unseen nick creating a stress fracture and you might loose model and engine.
Just my .051 cents.
Since the Windsor-Master Airscrew props I've put on the balancer all seem to not have the hub imbalance the Coxes do, I believe I'm switching brands.
Bare seems to think rather than balancing 1/2A props, just put the heavy blade directly opposite to the piston position(I think he means at TDC) and it will make up for the inadequate counterbalance of the crankshaft. There is actually some sense in that, but I think I'll keep balancing the blades and not worry so much about the hubs. Maybe I'll go so far as to put the heavy side of the hub opposite the piston. Can't hurt. And I'll be less likely to die while needling an engine.
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: Got a new prop balancer... and new questions
You don't want one of these,,with your fingers close by.
Listen to the evil sound it makes, when it parts company. Some light duty cursing.
https://www.youtube.com/watch?v=qQZpRHcmHtQ&feature=related
Listen to the evil sound it makes, when it parts company. Some light duty cursing.
https://www.youtube.com/watch?v=qQZpRHcmHtQ&feature=related
PV Pilot- High Tech Balsa Basher
- Posts : 1854
Join date : 2011-08-11
Age : 57
Location : The ragged end of the Universe.
Re: Got a new prop balancer... and new questions
This looks like a good little unit here, just spotted it. Has the adjustable thumb screw so you can set that tiny gap needed between tip and magnet. The cones push together instead of threaded cones like the ones on my small balancer.
http://www.sigmfg.com/IndexText/SIGSH903.html
http://www.sigmfg.com/IndexText/SIGSH903.html
PV Pilot- High Tech Balsa Basher
- Posts : 1854
Join date : 2011-08-11
Age : 57
Location : The ragged end of the Universe.
Re: Got a new prop balancer... and new questions
That works exactly like my Top-Flite balancer. I like it.
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: Got a new prop balancer... and new questions
RknRusty wrote:That works exactly like my Top-Flite balancer. I like it.
All the good balancers have a magnet supported shaft,,
![Wink](https://2img.net/i/fa/i/smiles/icon_wink.gif)
I have the Dubro wheeled version,, where the shaft rides on some pizza cutter style wheels and it isint as accurate as my magnetic ones. I do a reset(prop to shaft) and the balance changes each time,,where it doesen't with the magnetics.
The Sig one there looks to have a smaller shaft than the Top Flight, so your prop hub probably would not touch that,,depending on the prop.
You could get yourself a drill bit blank and rig up some spacers for your smaller prop hubs, to use with the Top Flight.
I caught a glimps somewhere of folks using nail polish for a balancing media. I'll stick to the tape, it is working good for me and not flying off.
PV Pilot- High Tech Balsa Basher
- Posts : 1854
Join date : 2011-08-11
Age : 57
Location : The ragged end of the Universe.
Re: Got a new prop balancer... and new questions
I'm not sure what you mean. I have to press the props onto the shaft, it's a pretty tight fit. In my experimenting when I first got it, I even tried balancing without the cones, or at least the flat side of one cone against the hub to make sure it's not crooked, in case the hole in the prop is bored crooked. Since then I've gone back to using both cones, one with the tapered nose inside the wider back side hub hole and the other cone with the flat side against the front hub.PV Pilot wrote:...The Sig one there looks to have a smaller shaft than the Top Flight, so your prop hub probably would not touch that,,depending on the prop.
You could get yourself a drill bit blank and rig up some spacers for your smaller prop hubs, to use with the Top Flight...
I hope my wording made sense in that statement.
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
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