Building up a shaft

Bikes or not. Whatever
jj.palmer
Holder of a Waxed Cotton Anorak
Holder of a Waxed Cotton Anorak
Posts: 322
Joined: Tue Oct 15, 2013 3:07 pm
Location: Denby Village, Derbyshire.
Contact:

Re: Building up a shaft

Postby jj.palmer » Mon May 04, 2020 2:10 pm

Whilst designing the mods. I had considered the spline cutting of a longish shaft and came up with two thoughts to a possible answer but at the time I did not persue it too deeply, my main thoughts being on cutting gear teeth for clocks .

Possible solutions :
1 Position the leverage mechanism between the chuck and the carriage thereby moving the cutting tool towards the tailstock.
2 Modify the tailstock by fitting an extension piece to extend the supporting "centre point" so that the leverage mechanism fits underneath.

Having the lathe still setup I will look into it further for a possible solution.

John P.

nevhunter
Holder of a Golden Anorak
Holder of a Golden Anorak
Posts: 4086
Joined: Tue May 10, 2011 9:42 am
Location: Victoria.. Australia.
Contact:

Re: Building up a shaft

Postby nevhunter » Tue May 05, 2020 11:54 pm

That is the question isn't it? There's an impact hard facing that goes on like bronze the name of which eludes me at the moment. Cobalide???The carbon in the gear material is your problem.. One of the stainless alloys might be the go. I've got a few with the same problem here. Nev

User avatar
simon.holyfield
Holder of a Golden Anorak
Holder of a Golden Anorak
Posts: 3850
Joined: Mon Oct 17, 2011 11:16 pm
Location: Norfolk
Contact:

Re: Building up a shaft

Postby simon.holyfield » Wed May 06, 2020 6:54 am

nevhunter wrote:That is the question isn't it? There's an impact hard facing that goes on like bronze the name of which eludes me at the moment. Cobalide???The carbon in the gear material is your problem.. One of the stainless alloys might be the go. I've got a few with the same problem here. Nev


It will be another interesting challenge (aren't they all?) but I'll check with Geoff Brown and see if he has one before I make a decision.
cheers

Simes

'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
http://ariel-square-four.blogspot.com

nevhunter
Holder of a Golden Anorak
Holder of a Golden Anorak
Posts: 4086
Joined: Tue May 10, 2011 9:42 am
Location: Victoria.. Australia.
Contact:

Re: Building up a shaft

Postby nevhunter » Wed May 06, 2020 12:36 pm

Hi test, the copper coated steel one might do it. You could heat treat the gear after welding and finishing. Nev
Last edited by nevhunter on Wed May 06, 2020 11:03 pm, edited 1 time in total.

jj.palmer
Holder of a Waxed Cotton Anorak
Holder of a Waxed Cotton Anorak
Posts: 322
Joined: Tue Oct 15, 2013 3:07 pm
Location: Denby Village, Derbyshire.
Contact:

Re: Building up a shaft

Postby jj.palmer » Wed May 06, 2020 4:44 pm

Simon, to answer your questions on the details of the units for spline cutting I'll post some pics. for each unit, here are the pics. for the leverage mechanism. The length of the lever is 500 mm, the distance from the levers pivot centre to the carriages link pin is 80 mm.

Hope this helps, will post pics. per unit per post to avoid any confusion.

John P.

PS you seem to be multi tasking, answering both Nev and myself.
Attachments
S6006252.JPG
S6006253.JPG
S6006254.JPG
S6006257.JPG
S6006260.JPG

jj.palmer
Holder of a Waxed Cotton Anorak
Holder of a Waxed Cotton Anorak
Posts: 322
Joined: Tue Oct 15, 2013 3:07 pm
Location: Denby Village, Derbyshire.
Contact:

Re: Building up a shaft

Postby jj.palmer » Thu May 07, 2020 12:48 pm

Simon, this is the breakown of the clapper box, see pics.

An additional hole is drilled in the toolpost to take the pivot pin.

The adjusting screw is tightened sufficiently to take out the vertical movement of the tool holder but still allows the rubber band to pull it back into position, the screw it is locked by the nut.

The 6 mm hole for the HSS cutting tool is on the centre line of the lathe spindle, it is drilled 20 mm deep and then the hole is drilled through with a 5 mm drill so that the cutting tool can be removed if it were to become tight. The cutting tool sits at the bottom of the 6 mm hole to withstand the cutting force, it is held by two 5 mm grub screws.

Also, there is the tool post clamp plate as previously mentioned.

John P.
Attachments
S6006264.JPG
S6006265.JPG
S6006266.JPG
S6006267.JPG
S6006268.JPG

jj.palmer
Holder of a Waxed Cotton Anorak
Holder of a Waxed Cotton Anorak
Posts: 322
Joined: Tue Oct 15, 2013 3:07 pm
Location: Denby Village, Derbyshire.
Contact:

Re: Building up a shaft

Postby jj.palmer » Sat May 09, 2020 10:47 am

Details of the chuck clamping unit, see pic, I had to drill and tap an additional hole in the headstock for the front screw (at a slight angle to miss the spindle flange), the rear screw is the one that also holds the the rear guard/tray. The clamping flange is 1mm thick and the holes are for both 3 and 4 jaw chucks.

John P.
Attachments
S6006272.JPG

jj.palmer
Holder of a Waxed Cotton Anorak
Holder of a Waxed Cotton Anorak
Posts: 322
Joined: Tue Oct 15, 2013 3:07 pm
Location: Denby Village, Derbyshire.
Contact:

Re: Building up a shaft

Postby jj.palmer » Sun May 10, 2020 2:17 pm

Simon, and finally the last unit that of indexing, see pics. etc., note some pics are in the next posting.

I did a test using an accurately ground vee block, see pic. and indexed it through each of its 90 degree faces, the results were comparitive with the predictions as shown on the "Principle of indexing" sheet, some results were slightly better and some slightly worse.
Overall I am quite satisfied that it is "reasonably" accurate.

Hope this helps,
John P.
Attachments
Indexing diagram.jpg
S6006279.JPG
S6006280.JPG
S6006278.JPG
S6006277.JPG

jj.palmer
Holder of a Waxed Cotton Anorak
Holder of a Waxed Cotton Anorak
Posts: 322
Joined: Tue Oct 15, 2013 3:07 pm
Location: Denby Village, Derbyshire.
Contact:

Re: Building up a shaft

Postby jj.palmer » Sun May 10, 2020 2:20 pm

Some more pics.

John P.
Attachments
S6006286.JPG
S6006291.JPG
S6006284.JPG

User avatar
LuisPaz
Holder of a Waxed Cotton Anorak
Holder of a Waxed Cotton Anorak
Posts: 320
Joined: Fri Jan 19, 2018 12:59 am
Location: Argentina
Contact:

Re: Building up a shaft

Postby LuisPaz » Mon May 11, 2020 2:58 pm

The jig to mounting on lathe remember this manual sharpe

http://www.lathes.co.uk/rapidelime/
Luis, from Argentina
1944 Ariel WNG


Return to “Main Chat Forum”

Who is online

Users browsing this forum: No registered users and 6 guests