The Shop > Tools

How to Cure a Lumpy Repton Radii Cutter in One Easy Lesson

<< < (2/2)

bp:
When I was investigating the spindle bearing upgrade on my Mini Lathe I looked up the basic dynamic load ratings of deep groove, angular contact ball and taper roller bearings.  I have just looked them up again and the numbers are.....
Deep Groove Ball Races 19,500N
Angular Contact Ball Races 23,800N
Taper Roller Bearings 44,000N
So TRBs are able to take higher loads by quite a lot!!  This means that the assembly will, as steampunkpete said be a lot stiffer.
cheers
Bill
ps Yes I used TRB in my lathe and they are excellent

BillTodd:
IMHO, a heavy oiled or greased plain bearing may be a better choice for this type of ball turner.

The cutting forces are not high , the rotary motion is slow and a good bit of viscous friction will help reduce chatter. The chatter in this case coming from the compliance of the handle & hand of the user. (my konkavdrehapperat device suffers from this if its plain bearing is loose).

You could probably even make a tapered plain bearing from a tapered roller bearing ring and a bronze plug to fit it.

Bill

Arbalist:
I put a plain bearing race in mine and it works quite well.

BillTodd:

--- Quote ---I put a plain bearing race in mine and it works quite well.
--- End quote ---

By plain bearing, i mean a non-rolling form bearing i.e. two sliding surfaces.

One thing you could try with your ball-turner is to use some high viscosity grease ( e.g. kilopoise) under the head (and maybe close the gap down a bit) to see if it improves you surface finish

Arbalist:

--- Quote from: BillTodd on November 04, 2015, 11:15:33 AM ---
By plain bearing, i mean a non-rolling form bearing i.e. two sliding surfaces.


--- End quote ---

I know what you meant. I was just saying I used a plain race rather than taper roller or angular contact.

Navigation

[0] Message Index

[*] Previous page