HG One wobble ?

#1: Post by **bmb** » November 20th, 2013, 7:42 pm

Today I realized that the shaft has a back and forth turning movement, of a few millimeters, while I hold the handle.
I know it wasn't there before, as I played with the grinder looking for tolerance issues and everything was tight.
I cannot feel any other movement, only this one, that seems to be in the transmission gears.
Is this normal break in (3 months, about 4kg) or should I do something about it ? Taste is Ok.

November 20th, 2013, 10:11 pm

if the gears still work and dont grind then I think its in alignment, so it probably wont hurt anything. Id check to see if there are bearings on the axle, it may have come unscrewed if there are.

#3: Post by **Seacoffee** » November 21st, 2013, 3:59 am

It is just the normal backlash. I have it on mine.

November 21st, 2013, 5:04 am

It's in alignment, and yes, it feels like backlash, just hope that it doesn't get worse.
As I don't know how the gears are fixed in the HG One, my concern is with a spline or keyway issue that could eventually break.

#5: Post by **Possepat** » November 21st, 2013, 8:01 am

Gears need a bit of clearance to function without locking up. That clearance manifests itself in the form of backlash. I've been around gearing my whole career, aligning, shimming, filing damaged gears by hand etc. I've got a first run HG-one and after all this time everything still feels normal. Keep an eye on it, just to make sure it doesn't get worse.

#6: Post by **JohnB.** » November 21st, 2013, 8:42 am

bmb wrote:It's in alignment, and yes, it feels like backlash, just hope that it doesn't get worse.
As I don't know how the gears are fixed in the HG One, my concern is with a spline or keyway issue that could eventually break.

The gear position on the shaft can be changed if you find there is too much movement. Just open up the gearbox & you'll see what I mean.

November 28th, 2013, 8:18 pm

It's crucial that the inner burr (shaft) remain perfectly centered in relation to the outer burr for consistent grinds during operation. Otherwise what's the point.

#8: Post by **Terranova** » November 28th, 2013, 9:08 pm

weebit_nutty wrote:It's crucial that the inner burr (shaft) remain perfectly centered in relation to the outer burr for consistent grinds during operation.

Yes, thats right.

weebit_nutty wrote:Otherwise what's the point

John was referring to the actual question of "bmb".
The gear backlash has no influence to the shaft and how centered the shaft is running.
It is just "cosmetical".

#9: Post by **Seacoffee** » November 29th, 2013, 6:23 am

Frank is of course right and my post had a slight error. Instead of saying "I have it on mine" I should have said everyone has it because it is perfectly normal and impossible to use bevel gears without some backlash.