Member postings for Andy Reynolds

Thanks to everybody who has responded. My apologies for the long gap – it was a result of leaving the office and switching the computer off for a fortnight in order to go away on holiday.

@DC31k @Michael Gilligan

Buying another bed to modify is a good idea. It seems somewhat profligate to chop one up in order to make what I need but I appreciate the lateral thinking.

@Nick Clarke 3 @ Martin of Wick @ JasonB @ old mart @ John Olsen @ Neil Wyatt

A larger lathe does seem to be the answer and I think I was being foolishly naive to think that a Myford could do this job. Whilst on holiday I went back through the original text and started laying out the process steps for each component.

I realised that the cylinder head needs to be mounted to the face plate on an offset in order to bore out the exhaust valve chamber and the flywheel also needs to be mounted on an offset to bore out the taper joints. Both of these jobs need a lot of room…

So that means using a raiser extension or raiser blocks and pushing things right to the very limit with all of the associated problems or simply admitting that I need more capacity…

@ Nigel McBurney 1

Which means that thanks to all of your input on this forum I have arrived at the answer of purchasing a larger capacity Boxford lathe – or similar - as the best answer.

@ JasonB

Thank you very much for taking the time to post the screen grab of the crankcase machining process. The book calls for a 4 jaw chuck but I think I prefer your approach. I also see somebody else has Solidworks

Thanks again to everybody who has taken the time to respond to my initial question. This is the first time I have used this forum and I really appreciate how people are willing to freely offer up their hard won knowledge.

Enjoy your day - Andy

Thank you very much Jann that book is now on order. Aside from the additional work in fabricating the spindle raiser I would be worried about the additional load placed on the lathe and the resultant final accuracy one could achieve.

It looks like the sensible option is to cough up for a larger lathe or find a milling machine to complement the myford.

Many thanks - Andy

I am in the process of sorting out the CAD I have developed to create patterns that will be 3D printed for sand casting. .

I am afraid that I don't have a milling machine hence my attempt at trying to get the parts to fit on a face plate somehow...

Thanks to both of you for the quick response.

Well it looks like I have the following options:

(a) change the engine design which is not something I wish to do

(b) look for a larger capacity lathe which is not something I wish to do

(c) go research and then build my own copy of the myford spindle raiser as I am assuming no commercial offerings are available.

I was aware of the madmodder link posted. I found that link a while back and saw that he went away from the original plans that Hasluck gave. My version of the bike is an attempt to be as authentic as possible to see what it would have been like to build and ride back in 1906.

Cheers - Andy

I have been scratching my head for a while now so I thought I would come and ask the experts...

I am planning on building an engine, the original plans of which can be found here:

https://archive.org/details/motorbicyclebuil00hasliala/page/66

I am concerned that if I purchase a Myford 7 lathe then I will be exceeding the Myford's maximum capacity.

The engine crankcase measures roughly 9" in diameter by 2" in depth.

Does anybody have any practical knowledge as to what I can safely squeeze in without resorting to a homemade spindle raiser?

Cheers,

Andy