Forum sponsored by:

20/40 DP gear hob

What is 20/40 DP?

Search for: in Thread Title in

GoCreate	24/12/2011 04:53:41
387 forum posts 119 photos	Hi I was looking at gear hobs on ebay. This one is described as 20/40 DP, I know what 20 DP is and what 40DP is. How can it be both 20/40 DP? Can anyone explain this description? Cheers Nigel
GoCreate	24/12/2011 06:05:41
387 forum posts 119 photos	Spoke to soon I found the answer here It's not an involute gear hob but it is an involute spline hob. The spline is 20DP but has a shallow depth equivalent to 40DP. So no good for cutting gears I presume. Nigel.
John Stevenson	24/12/2011 17:32:44
5068 forum posts 3 photos	No, as you say they are for splines. I have bought quite a few hobs off this guy, don't be put off by the life left in the pics, he tends to use the same picture and all the ones I have had have had far more life in them. He does have other hobs but usually metric. I think ARC still has some imperial hobs left John S.
Richard Parsons	27/12/2011 08:35:41
645 forum posts 33 photos	Does anyone know where to find the ‘wire’ sizes for making involute cutters and hobs? rdgs Dick
Rufus Roughcut	27/12/2011 10:46:33
83 forum posts 20 photos	Hi Dick Try Hear http://books.google.co.uk/books?id=J2p2yBMOyI4C&pg=PA9&lpg=PA9&dq=involute+gear+hob+wire+sizes&source=bl&ots=OFpkKgEnZV&sig=Js6BA9oOQsHf3vfONG3nM8ao9G8&hl=en&sa=X&ei=NqH5TvTQDsPotQbBu5nSDw&sqi=2&ved=0CG4Q6AEwBw#v=onepage&q=involute%20gear%20hob%20wire%20sizes&f=false which may be of use
John Stevenson	27/12/2011 12:19:26
5068 forum posts 3 photos	Dick, As far as I know there are no published tables but worked out by the makers of the hobs. The tables in the linked page above are for gears and not hobs. Hobs will be different in that they have to take clearance into account. John S.

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

You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy

Latest Forum Posts

*Oct 2023: FORUM MIGRATION TIMELINE*
05/10/2023 07:57:11
Making ER11 collet chuck
05/10/2023 07:56:24
What did you do today? 2023
05/10/2023 07:25:01
Orrery
05/10/2023 06:00:41
Wera hand-tools
05/10/2023 05:47:07
New member
05/10/2023 04:40:11
Problems with external pot on at1 vfd
05/10/2023 00:06:32
Drain plug
04/10/2023 23:36:17
digi phase converter for 10 machines.....
04/10/2023 23:13:48
Winter Storage Of Locomotives
04/10/2023 21:02:11
More Latest Posts...
View All Topics

Support Our Partners

Shopping Partners

Subscription Offer

Latest "For Sale" Ads

Reeves** - Rebuilt Royal Scot by Martin Evans
by John Broughton
£300.00
BRITANNIA 5" GAUGE James Perrier
by Jon Seabright 1
£2,500.00
Drill Grinder - for restoration
by Nigel Graham 2
£0.00
WARCO WM18 MILLING MACHINE
by Alex Chudley
£1,200.00
MYFORD SUPER 7 LATHE
by Alex Chudley
£2,000.00
More "For Sale" Ads...

Latest "Wanted" Ads

D1-3 backplate
by Michael Horley
Price Not Specified
fixed steady for a Colchester bantam mark1 800
by George Jervis
Price Not Specified
lbsc pansy
by JACK SIDEBOTHAM
Price Not Specified
Pratt Burnerd multifit chuck key.
by Tim Riome
Price Not Specified
BANDSAW BLADE WELDER
by HUGH
Price Not Specified
More "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