By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Forum House Ad Zone

Trepanning a deep hole in en24t

All Topics | Latest Posts

Search for:  in Thread Title in  
Windy15/03/2017 18:04:45
avatar
910 forum posts
197 photos

 

I would like to trepan a hole inner Ø 65mm outer Ø 76 110mm deep in en24t.

When 110mm reached it would be parted off a Ø160mm billet x 160mm long

That would leave me a pipe to make my cylinder for my latest project and rest of the billet for a crankshaft.

Have found the en24t ideal for my flash steam hydro cylinder better than a cast iron liner (130+ mph).

It seems such a waste just machining the billet to crankshaft size.

I wonder if my Warco 600 would cope with a trepanning tool of the quoted size.

It would be a home made trepanning tool with either Brazed Carbide or HSS tips.

Any suggestions on a feasible design I have used a 50mmØ hole saw on stainless for a 25mm depth but this project requires a change of design.

The width of the cutter tips can be a lot narrower as dimensions not critical for the roughed out blanks.

Looking at commercial trepanning in the link seems a great deal of power required.

**LINK**

One half of crank roughed out other half to do yet then to finish to size.

Happy days after all those weeks in hospital also got hands oily helping my friend with his TR6 gearbox strip down.

No automatic alt text available.

 

At moment with my latest hair do I look more like Homer Jay Simpson as was told today the following picture was taken a few years ago. 

Image may contain: 1 person, smiling, car, sky and outdoor

 

 

 

 

Edited By Windy on 15/03/2017 18:05:43

Edited By Windy on 15/03/2017 18:17:13

Edited By Windy on 15/03/2017 18:19:13

Edited By Windy on 15/03/2017 18:36:12

HOWARDT15/03/2017 18:22:58
1081 forum posts
39 photos

One big problem you will have is getting the swarf out. With carefully cutter design you can use high pressure coolant and get the swarf back out through the cutter. This would make rather a mess on an open machine. Power required would depend on how many cutting edges you can get in.

John Stevenson15/03/2017 18:32:11
avatar
5068 forum posts
3 photos

By the time you have made the tool, broke it and remade it you could have just bored it out. It's not like it's gold, you are not even saving pence on material given the time needed and mistakes made.

Windy15/03/2017 18:39:01
avatar
910 forum posts
197 photos
Posted by John Stevenson on 15/03/2017 18:32:11:

By the time you have made the tool, broke it and remade it you could have just bored it out. It's not like it's gold, you are not even saving pence on material given the time needed and mistakes made.

You are probably correct so will give it a rethink.

HOWARDT15/03/2017 20:45:44
1081 forum posts
39 photos

Why not drill a ring of holes as close together as possible and saw to join up, much easier for the cost of a couple of long drills.

Ian P15/03/2017 21:25:51
avatar
2747 forum posts
123 photos
Posted by HOWARDT on 15/03/2017 20:45:44:

Why not drill a ring of holes as close together as possible and saw to join up, much easier for the cost of a couple of long drills.

The mind boggles!

John Ockleshaw 116/03/2017 00:50:28
avatar
56 forum posts
7 photos

Hello Windy,

Can you get access to a sink type spark eroder ?. Use a piece of copper tube for the electrode.

Regards, John

John Stevenson16/03/2017 00:59:13
avatar
5068 forum posts
3 photos

A spark eroder will take a minimum of 5 hours to drop down 110mm. At a running rate of say £70 per hour that will cost you £350 to save a £10 piece of EN24.

Priceless - literally

John Ockleshaw 116/03/2017 06:41:17
avatar
56 forum posts
7 photos

To John Stevenson,

At my place the spark erosion would cost a few KWHr's of electricity. Almost priceless.

John

Kettrinboy16/03/2017 08:10:48
94 forum posts
49 photos

I think the stress on both you and the lathe attempting something like this would take years off your life expectancy, as previously said the swarf off 24t is not that easy to break into chips on this type of operation and would wrap itself around in the groove and cause a jam up , better spend a bit more money on materials and make the parts the easy way.

regards Geoff

Edited By Kettrinboy on 16/03/2017 08:11:24

Windy16/03/2017 09:49:26
avatar
910 forum posts
197 photos

Afraid it's the Yorkshire man in me i.e. a Scotsman with the generosity squeezed out trying to save money on materials.

So thanks for the suggestions but Johns suggestions to buy more material is the correct way to go.

Wish I could get my en24t at the price he said.

A trade price that my engineering business friend got me with no charge for vat 160mm Ø x 160mm long was over £50.

As an acquaintance from my past he used to watch me doing my thing at sprints and record attempts when he was younger he has even offered to pay for materials like when he got me two billets of 2014 for the crankcases.

I see his speed creations a lot machined on his CNC machines and just look in wonderment we both talk the same language so it's a none stop natter when we meet.

He his a gentleman to the speed scene and has helped many speed enthusiasts to fulfil their dreams.

Here are some of his projects he has done a lot of machining for.

**LINK**

His friends Gem turbine undergoing tests for a land speed motor bike project

No automatic alt text available.

Chris Evans 616/03/2017 10:08:03
avatar
2156 forum posts

I buy offcuts from a local steel stockholder, depending on who serves me when I have found a suitable piece (which can be a few visits) the prices vary. On occasion I get lucky and someone will look at the piece and ask for say £10/15. Others will put it on the scales or calculate the weight and then give a cost. Last time I was given a cost was £30 on an invoice or £15 cash. Cash is King ! Having got to know the people at the stockholders does get favours where they will set up a saw and cut for me. This saves me hours over using my "Donkey" saw at home.

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

Sign up to our Newsletter

Sign up to our newsletter and get a free digital issue.

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

Latest Forum Posts
Support Our Partners
cowells
Sarik
MERIDIENNE EXHIBITIONS LTD
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

 

Donate

donate