Thanks: 0
Likes: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 1 to 13 of 13
Thread: dial fault
-
26th June 2011, 11:08 AM #1
Mechanical Butcher
- Join Date
- Oct 2004
- Location
- Southern Highlands NSW
- Posts
- 920
dial fault
I have a problem with the Hercus lathe handwheel dials drifting off, when the wheel is turned backwards. This is annoying, when I need to back off and advance again. It can behave OK when going forward, but backwards its face rubs the stationary part in such a way that, unless locked with its grubscrew, it can move off its initial position. It's a nuisance to always have to lock the grubscrew.
I think there is scope to improve this, by isolating the dial so it doesn't rub on its faces, and so stays where it's put, even when backing off. I made some changes on my 9" which achieve this, but it's a bit of a kludge and I wondered if there's a neater solution.
I wonder if fitting frictionless thrust bearings, such as is a popular modification by our US friends with their South Bends, would stop it drifting?
Jordan
-
26th June 2011 11:08 AM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
26th June 2011, 11:59 AM #2
GOLD MEMBER
- Join Date
- Oct 2010
- Location
- melbourne, laverton
- Posts
- 1,469
how about just a little knurled locking bolt. for the ring. is the ring catching on a bur?
and well lubed
-
26th June 2011, 03:44 PM #3
Mechanical Butcher
- Join Date
- Oct 2004
- Location
- Southern Highlands NSW
- Posts
- 920
A knurled screw is an option, thanks.
There's no burr or anything - just the friction of steel flat surfaces rubbing each other is enough to upset the adjustment. Oil could help I suppose.
Has nobody else experienced this?
Jordan
-
26th June 2011, 04:48 PM #4
SENIOR MEMBER
- Join Date
- Oct 2007
- Location
- Sydney
- Posts
- 2,340
I always lock my collars before relying on any measurement from them. I just made up some little knurled knobs in brass, but an alternative in steel with a brass shoe on the bottom would possibly be better. I just happened to have some brass handy and quite like the look, they only take a few minutes each.
Pete
-
26th June 2011, 09:53 PM #5
Senior Member
- Join Date
- Nov 2008
- Location
- Sydney
- Posts
- 120
Make sure the set screw has a brass pad between itself and the shaft, they are easilly lost if the dial is removed. The pad is approx 1.5mm thick and provides a more controlled friction between the set screw and the shaft. The dial is less likely to slip with the pad in place.
Chas.
-
26th June 2011, 11:06 PM #6
.
- Join Date
- Nov 2008
- Location
- Perth WA
- Age
- 71
- Posts
- 5,650
Originally Posted by Pete F
I always lock my collars before relying on any measurement from them. I just made up some little knurled knobs in brass, but an alternative in steel with a brass shoe on the bottom would possibly be better. I just happened to have some brass handy and quite like the look, they only take a few minutes each.
Pete
When you make proper ones out of steel, I'll lend you my fine knurls. I suppose brass festoons the mill as well.
And another thing Pete, nice paintwork.
-
26th June 2011, 11:26 PM #7
SENIOR MEMBER
- Join Date
- Oct 2007
- Location
- Sydney
- Posts
- 2,340
Yes I was expecting you to accuse me of a staged photo Bob, where I polished up the lathe first. But no, just raced down, took the shots and raced back, you can actually see a pile of swarf on the saddle in the second photo albeit out of focus.
No, I think the brass will stay, I'm not going to spend another 30 minutes making 5 more for these machines, besides some of us get our hands greasy Bob and need all the knurl we can get
Pete
-
27th June 2011, 09:25 AM #8
Mechanical Butcher
- Join Date
- Oct 2004
- Location
- Southern Highlands NSW
- Posts
- 920
That's a splendid defence of your nice yellow screws, Pete. Originally Posted by Pete F
No, I think the brass will stay, I'm not going to spend another 30 minutes making 5 more for these machines, besides some of us get our hands greasy Bob and need all the knurl we can get
Pete
Where to you put 5 of them?
Jordan
-
27th June 2011, 09:45 AM #9
SENIOR MEMBER
- Join Date
- Oct 2007
- Location
- Sydney
- Posts
- 2,340
I have a Hercus mill as well and it has the same collar arrangement.
-
27th June 2011, 10:10 AM #10
.
- Join Date
- Nov 2008
- Location
- Perth WA
- Age
- 71
- Posts
- 5,650
To maintain the spick and span myth, I should have cleaned these little blighters up before they had their photo taken.
-
27th June 2011, 10:44 AM #11
Fixer and Mangler
- Join Date
- Apr 2004
- Location
- Melbourne
- Age
- 64
- Posts
- 250
Nice idea and execution Bob and Pete,
What is the thread on these screws?cheers
David
------------------------------------------------
A society grows great when old men plant trees whose shade they’ll never sit in. (Greek proverb)
-
27th June 2011, 11:51 AM #12
.
- Join Date
- Nov 2008
- Location
- Perth WA
- Age
- 71
- Posts
- 5,650
Plain old 3/16" BSW on the little ones and a 1/4" BSW on the big one.
-
27th June 2011, 12:00 PM #13
Fixer and Mangler
- Join Date
- Apr 2004
- Location
- Melbourne
- Age
- 64
- Posts
- 250
Yippee,
3/16 BSW is something I have! (I had feared a BA thread)
Thank you
Davidcheers
David
------------------------------------------------
A society grows great when old men plant trees whose shade they’ll never sit in. (Greek proverb)
Similar Threads
-
IT'S The Wife's Fault.
By wm460 in forum WOODTURNING - PEN TURNINGReplies: 19Last Post: 10th February 2010, 09:30 PM -
It's all your fault
By jmk89 in forum WOODWORK - GENERALReplies: 9Last Post: 11th April 2006, 04:34 PM -
Its all your fault
By beejay1 in forum SCROLLERS FORUMReplies: 13Last Post: 10th February 2005, 03:10 PM
