By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale July 23rd

Collets ground or unhardened?

All Topics | Latest Posts

Search for:  in Thread Title in  
Chris TickTock26/08/2019 11:36:07
163 forum posts
1 photos

Hi I read somewhere someone had a collection of collets hardened and some unground. As a green horn when I buy something I generally assume it is ready for use. Are collets generally sold hardened ready for use and what is the virtue of buying unground collets?



SillyOldDuffer26/08/2019 11:57:30
4591 forum posts
980 photos

Most collets are hard and ready to go. I don't recognise "unground collets" as a thing, but you may mean "Emergency Collets". These are sold soft so you can drill out the centre to hold a non-standard size. Explanation here at ArcEuro.


Andrew Johnston26/08/2019 11:57:57
4777 forum posts
538 photos

Collets are normally supplied hardened. However, some collets can be bought unhardened. These are often known as emergency collets. These collets are machined to fit the holder but the bore is left solid. This is so the user can machine the collet in situ to hold a special size or shape of work. The emergency collets may, or may not, be slit. The 5C emergency collets sold by Arc are slit and supplied with pins to hold the fingers apart during machining. On the other hand I have several emergency collets for my Pultra lathe where the nose is unmachined and the collet is unslit.

Chris: As an aside your post about WW collets implies you're in Cambridge? If so I'm close to Cambridge, out to the west, so youre welcome to visit and rabbit about machining. PM me if interested.


Chris TickTock26/08/2019 12:51:14
163 forum posts
1 photos

Thanks Guys I have been ferreting around there are apparently unhardened collets such as some 4 jaw brass and aluminium. Hardened and ground is how most machinists would buy quality collets. Hardened collets grip with a dependable force and being ground they sit in a concentric fashion.


All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Support Our Partners
Eccentric July 5 2018
TRANSWAVE Converters
Advertise With Us
Meridienne oct 2019
Eccentric Engineering
Allendale Electronics
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest