Aermotor A702 cracked/ broken hub

......when you need to get in the weeds.
Post Reply
bluezx6r
Posts: 32
Joined: Sat Jun 22, 2019 6:21 pm

Aermotor A702 cracked/ broken hub

Post by bluezx6r »

Hi all, I've got an Aermotor A702 with a broken piece on the front of the hub where the spokes thread into it. The previous owner did a spot weld to hold it together, and had the spokes threaded in and up on a tower outside, but not using it. I dont trust the weld job as is, however if one took their time and did a good weld, do you think the hub will be salvageable to function as intended again? Just curious what your experiences have been which such repair.
IMG_20200107_064636612.jpg
IMG_20200107_064729031.jpg
IMG_20200107_064658149.jpg
You do not have the required permissions to view the files attached to this post.
User avatar
windybob
Posts: 3508
Joined: Mon Jan 14, 2019 5:59 pm
Location: Ames Oklahoma

Re: Aermotor A702 cracked/ broken hub

Post by windybob »

From what I can tell, the short answer would be yes. Just my opinion.
Call Dan Benjamin for parts. P M me for the phone number.
JLM
Posts: 68
Joined: Fri Oct 11, 2019 1:59 pm
Location: Texas

Re: Aermotor A702 cracked/ broken hub

Post by JLM »

Good properly prepared welds made with nickel will hold up to alot of stress.
bluezx6r
Posts: 32
Joined: Sat Jun 22, 2019 6:21 pm

Re: Aermotor A702 cracked/ broken hub

Post by bluezx6r »

Good copy, thank you gentlemen!
Ron Stauffer
Posts: 431
Joined: Fri Dec 14, 2018 10:25 am
Location: Uncompahgre Plateau Montrose CO
Contact:

Re: Aermotor A702 cracked/ broken hub

Post by Ron Stauffer »

This isnt an easy slam dunk as it appears as the breaks both appear to be thru the wheel arm holes. It is very hard to get good realignment of the threads when there is a break across two holes as cast can stretch before it breaks. Check the alignment & looseness with a good bolt of proper thread. Use the other holes for comparison. You can have a weld that holds but can also have a hole that wont keep a spoke.

The old welds are not Ni so that is a hindrance to a "good" weld. Also your breaks are thru the holes where you have the least amount of material to weld at.

Dont rely too heavily on "it was up and spinning as is" as sites will vary on the stress it put on a mill And a furled mill has less stress than one that is always open.

Check the Ni rod cut sheet in the other post for the desired rod to use.

Ron Stauffer
Montrose CO
JLM
Posts: 68
Joined: Fri Oct 11, 2019 1:59 pm
Location: Texas

Re: Aermotor A702 cracked/ broken hub

Post by JLM »

Ron is spot on about those spoke holes. If this mill was a rare hard to find mill or a has sentimental value I would repair it. Or if your trying to save money and repair it yourself. Otherwise you are better off to chunk it and get another hub and shaft assembly. Loose or crooked spokes can be a wreck at the least the wheel will not track properly/wobble or worse allow the wheel to hit the tower.
Post Reply