Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Foo Off-Topic chit chat with no general subject.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 02-16-06, 05:02 PM   #1
phantomcow2
la vache fantôme
Thread Starter
 
phantomcow2's Avatar
 
Join Date: Aug 2004
Location: NH
Bikes:
Posts: 6,266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Uh oh... i think i screwed up on ebay

Okay well I just sold two ballscrews for 11 bucks each, same guy and all. I advertised them as what i believed them to be, 5/8 ROLLED ballscrew (rolled is pretty cheap, about 1.25 per inch). But i looked very carefully, and had another person look. It sure did not look rolled, but i did not think it was ground. Until i came across a picture of a true ground (very expensive and valuable) ballscrew. And these look identical....
So i think that what i sold, the guy believed it was 5/8 .2 rolled.
But now I am thinking its 16mm OD with a 5mm pitch, precision ground. The latter is MUCh more valuable, probably 5x the price.

So what do i do? I was thinking i would email the guy, let him know whats up. If he wants his money back, i will refund entirely. If he wants these screws, i will sell them to him at the same price.
__________________
C://dos
C://dos.run
run.dos.run
phantomcow2 is offline   Reply With Quote
Old 02-16-06, 05:05 PM   #2
jschen
riding once again
 
jschen's Avatar
 
Join Date: Oct 2005
Location: San Diego, CA
Bikes: '06 Cervelo R3, '05 Specialized Allez
Posts: 7,359
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Mistakes happen. Oh well. Sounds like a reasonable plan for handling the situation.
__________________
If you notice this notice then you will notice that this notice is not worth noticing.
jschen is offline   Reply With Quote
Old 02-17-06, 02:39 AM   #3
PhilThee
Downhill Racer
 
PhilThee's Avatar
 
Join Date: Jan 2006
Bikes: 1994 Bridgestone RB1, 2006 Cannondale R1000, 2007 Cannondale Caad9 Optimo2
Posts: 739
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Well if they really are different from what you listed then you truly did make a mistake.
I feel you are not entitled to sell them to him. Do what you want, your call. Whatever you do, be decent about it.

Way too many aholes and rip off artists on Epay.
PhilThee is offline   Reply With Quote
Old 02-17-06, 02:57 AM   #4
blue_neon
Elite Rep
 
Join Date: Aug 2004
Location: Melbourne - Australia
Bikes:
Posts: 2,096
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Just be nice about it all, you dont want negative feedback
blue_neon is offline   Reply With Quote
Old 02-17-06, 08:23 AM   #5
Eggplant Jeff
45 miles/week
 
Eggplant Jeff's Avatar
 
Join Date: Mar 2005
Location: Philadelphia, PA
Bikes: Jamis Aurora
Posts: 2,020
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If they will FUNCTION the same as the less valuable pieces, it is up to him whether to finish the purchase or not (and it sounds like he probably would, unless he's exceptionally nice to you). If they are not as good for some reason, then I'd still leave it up to him but explain that very carefully.

Basically either way I'd let him make the choice. If YOU decide to cancel the sale, he'd be justified in leaving you bad, or at least neutral, feedback (maybe he passed up other ones he could have bid on because he got yours).
__________________
Treasurer, HHCMF Club
Now living in the land of the cheesesteak.
But working at a job where I can't surf BikeForums all day any more...
Eggplant Jeff is offline   Reply With Quote
Old 02-17-06, 08:34 AM   #6
catatonic
Chairman of the Bored
 
catatonic's Avatar
 
Join Date: May 2004
Location: St. Petersburg, FL
Bikes: 2004 Raleigh Talus, 2001 Motobecane Vent Noir (Custom build for heavy riders)
Posts: 5,825
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Pretty much just inform him and let him decide...if you back down, you technically broke a contract, so it's best to get both sides to agree.

Consider this a lesson in thorough researh on an item before selling it. I've gotten some obscenely good deals on Ebay before, where the seller didn't know what something was worth and put a way too low buy it now price.
catatonic is offline   Reply With Quote
Old 02-17-06, 03:03 PM   #7
monogodo
NFL Owner
 
monogodo's Avatar
 
Join Date: Sep 2004
Location: Irving Heritage District
Bikes: 7-Eleven Eddy Merckx, Vitus Futural, Catamount FRS, Colnago SL, SS MTB
Posts: 1,489
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Go out and buy a pair of the screws you sold him and send them to him.

Then correctly list the ones you have.
monogodo is offline   Reply With Quote
Old 02-17-06, 03:53 PM   #8
dragracer
Senior Member
 
Join Date: Aug 2002
Bikes:
Posts: 620
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ok I am gonna show my ignorance.....What the hell is a ballscrew?
dragracer is offline   Reply With Quote
Old 02-17-06, 04:12 PM   #9
phantomcow2
la vache fantôme
Thread Starter
 
phantomcow2's Avatar
 
Join Date: Aug 2004
Location: NH
Bikes:
Posts: 6,266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
okay i explained. He was nice about it, said its no problem and he is only just beggining to gather components for a building his own CNC milling machine like 5bears.com
Impressive....

I refunded his money, he said we leave eachother positives
__________________
C://dos
C://dos.run
run.dos.run
phantomcow2 is offline   Reply With Quote
Old 02-17-06, 05:41 PM   #10
55/Rad
Senior Member
 
55/Rad's Avatar
 
Join Date: Jan 2004
Location: Portland, OR
Bikes: Seven Axiom
Posts: 11,696
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Ummm yeah, what's a ballscrew?
__________________
55/Rad is offline   Reply With Quote
Old 02-17-06, 05:59 PM   #11
phantomcow2
la vache fantôme
Thread Starter
 
phantomcow2's Avatar
 
Join Date: Aug 2004
Location: NH
Bikes:
Posts: 6,266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
__________________
C://dos
C://dos.run
run.dos.run
phantomcow2 is offline   Reply With Quote
Old 02-18-06, 10:46 AM   #12
dragracer
Senior Member
 
Join Date: Aug 2002
Bikes:
Posts: 620
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Aaight I see it but I still have no idea what it is. Looks like a (heavy duty)piece of Allthread to me.
dragracer is offline   Reply With Quote
Old 02-18-06, 11:59 AM   #13
phantomcow2
la vache fantôme
Thread Starter
 
phantomcow2's Avatar
 
Join Date: Aug 2004
Location: NH
Bikes:
Posts: 6,266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Well its a leadscrew. A leadscrew is used to control linear motion. So say you have a nut, and attached to the nut is a mug of coffee. THe nut is on a screw (any screw, allthread works too), and the screw is axially fixed. Meaning, it cannot be moved in any way except rotated.
Say the leadscrew is a piece of allthread 3/8-16, that means every the screw itself makes, the nut (and mug of coffee), moves 1/16 an inch.

THis is what a ballscrew is, a leadscrew. Now why its called a ballscrew...
Look at a piece of allthread, or acme rod if you happen to have some sitting around with a matching nut. When you have the screw traverse, there is friction. THe peaks that form the threads are sliding. So when one moves the nut, they have to overcome the friction of sliding elements.

But a ballscrew is different because it uses ball bearings. Ball bearings roll where a regular 60 degree rod would slide, so you have significantly less friction to overcome. THis makes the ballscrew a good 90% efficient, vs the acme or allthreads 30%ish. Because of the sliding, your regular threaded rod would generate a lot of heat if it was to be moving fast. Where a ballnut on a matching screw can move very quickly, with litlte heat buildup
__________________
C://dos
C://dos.run
run.dos.run
phantomcow2 is offline   Reply With Quote
Old 02-20-06, 06:48 AM   #14
cuda2k
Unique Vintage Steel
 
cuda2k's Avatar
 
Join Date: May 2005
Location: Allen, TX
Bikes: Kirk Frameworks JKS-C, Serotta Nova, Gazelle AB-Frame, Fuji Team Issue, Schwinn Crosscut, All-City Space Horse
Posts: 11,486
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Good explaination. Learn something new every day around here.
cuda2k is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 05:23 PM.