Whetstone
Cast Iron
- Joined
- Mar 27, 2011
- Location
- Providence RI
I very new to mandrel bending, and am experiencing some issues that I’m hoping to get some help with.
Material is 1.5” diameter 385 brass with 0.125 wall. I believe the temper is hard.
Machine is a pines #2
1 ball chrome mandrel
The issue I am experiencing is two fold. One, which is minor is that the diameter of the cross-section of the tube in the middle of the the bend is reducing by about 0.016”. Is this within the acceptable range for what I can get out of a basic machine? I have the mandrel nose about as far forward as I can get, which is about .375” past tangent.
The second issue is more important to solve as these are going to be mirror polished abs the distortion will be noticeable. I am getting a weird stretch at the trailing end of the bend. It looks to be about an inch long abs is a completely different angle. Any ideas what could be causing this? Pictures are of both a 45° and 90° bend.
Sent from my iPhone using Tapatalk
Material is 1.5” diameter 385 brass with 0.125 wall. I believe the temper is hard.
Machine is a pines #2
1 ball chrome mandrel
The issue I am experiencing is two fold. One, which is minor is that the diameter of the cross-section of the tube in the middle of the the bend is reducing by about 0.016”. Is this within the acceptable range for what I can get out of a basic machine? I have the mandrel nose about as far forward as I can get, which is about .375” past tangent.
The second issue is more important to solve as these are going to be mirror polished abs the distortion will be noticeable. I am getting a weird stretch at the trailing end of the bend. It looks to be about an inch long abs is a completely different angle. Any ideas what could be causing this? Pictures are of both a 45° and 90° bend.
Sent from my iPhone using Tapatalk