Jonsered safety interlock - can u help?

[purple badger]

Aw mate! That's amazing! Thank you!

 

It looks like your drawing is slightly larger than the part? Guess you traced round it. Is there any chance you could place the ruler next to the part and take a photo of it on its side and then another one from the top so I can get its thickness? That way I'll get it right in CAD.

 

No worries if you can't, I know you've got to be busy if you're anything like me, I'll just work with what you've given me and I should be able to get it right after iterating a few versions and some test fits.

 

Thanks loads - what you've already done is amazing

 

Edit: sorry, just realised I was thinking of the part upside down! I mean the thickness from underneath not on top - I.e where the slot is cut. It's the length and width/thickness of that slot that would be useful which I can get from a photo.

Edited January 22 by purple badger

[adw]

It’s not the easiest thing to measure.

 

[purple badger]

That's perfect - thank you so much! (Think you must have nicked my favour calipers there 😆 I've lost mine somewhere in the workshop and only can only find my nasty digital ones at present) 

 

I'll get onto modelling that up in CAD over the next week and post a pic when I'm done. After that comes the real moment of truth - will it fit! But if a project but fingers crossed that I can get something that works and an STL model up on thingiverse so others can print thier own part.

 

 

[adw]

It was in for a service, see what I mean about lack of maintenance. Anyway do not forget there in an opening in the base to house the spring.

 

[openspaceman]

22 minutes ago, purple badger said:

That's perfect - thank you so much! (Think you must have nicked my favour calipers there 😆 I've lost mine somewhere in the workshop and only can only find my nasty digital ones at present) 

 

I'll get onto modelling that up in CAD over the next week and post a pic when I'm done. After that comes the real moment of truth - will it fit! But if a project but fingers crossed that I can get something that works and an STL model up on thingiverse so others can print thier own part.

 

 

My Massi verynears were issued to my morcycling mate in the mid fifties, for measuring the diameter of polythene fuel tube as it fell from the die, the diameter varied by the height it fell into a bucket of water to cool it, one of his jobs was to set the height of the water. He passed them to me when he retired over 40 years ago.

 

I don't have a 3d printer but the idea of printing obsolete parts like this is fantastic, will it be strong as original?

[purple badger]

5 hours ago, adw said:

It was in for a service, see what I mean about lack of maintenance. Anyway do not forget there in an opening in the base to house the spring.

 

That's the badger - yup won't forget, I'm just hoping that it's fairly obvious how it fits together as I'm missing both arm and spring. Should be reasonably easy to create a spring from a bit of piano wire though.

 

That's one dusty filter and carb - always amazes me that people don't clean them out more regularly themselves. I had a mates on the bench a few weeks back and it was clear he'd never touched it!

 

4 hours ago, openspaceman said:

My Massi verynears were issued to my morcycling mate in the mid fifties, for measuring the diameter of polythene fuel tube as it fell from the die, the diameter varied by the height it fell into a bucket of water to cool it, one of his jobs was to set the height of the water. He passed them to me when he retired over 40 years ago.

 

I don't have a 3d printer but the idea of printing obsolete parts like this is fantastic, will it be strong as original?

 

Those were the days, mine are probably of the same vintage passed to me by an old engineer - they never run out of battery (because they don't have one) and you can't accidently click the digital re-calibrate button and screw everything up. There is literally no reason I can think of for modern digital calipers!

 

3d printers are the dogs. I never thought I'd say that, thought It'd be little used when I got one for the workshop, but it's one of my most useful bits of kit, it's even been used to replace broken water tank, car, bike and washing machine parts at home. An FDM printer is a brilliant bit of kit for £200ish if you spend the time to learn CAD. The plastic for printing is only £15 per kg so it's cheap, most printed parts end up costing way less than £1. More importantly, when you break some small important plastic something you don't think 'oh cr*p!' - you just go 'aw well, I'll print another' - that's worth it's weight!

 

The part will be as strong as the material that's used to print it. In this case, it'll be plenty strong enough in PET-G plastic, but you could use ABS or Nylon if you wanted 'stronger'. PLA would be stronger still (hard), but brittle with it, so not a good choice for anything other than a prototype. The enemy is heat as the parts would deform, but PET-Gs only going to start deforming at 75*C so you're going to have bigger problems if the handle is getting that hot 😂

Edited January 22 by purple badger

[purple badger]

So the prototype model is ready - not quite printable yet as I need to add some breakaway supports to a few areas, but almost there.

 

@adw Thanks for all your help - not sure if I got the slot highlighted with a red circle in the pic right - did it look like this? I've also made a guess at the depth of the slot in the main handle, pretty sure that can't be too critical as I imagine it's just for the spring.

 

We're well on the way to bringing an obsolete part back - thanks for all the contributions.

 

[adw]

I will check tomorrow, it’s been in and out of the saw like a fiddlers elbow, I will take a pic of the spring as well.

[purple badger]

16 minutes ago, adw said:

I will check tomorrow, it’s been in and out of the saw like a fiddlers elbow, I will take a pic of the spring as well.

Didn't realise you were pulling it out of the saw each time! That's above and beyond.... Honestly mate - if it's a load of effort don't worry and I can figure it out, you've done enough already.

[adw]

44 minutes ago, purple badger said:

Didn't realise you were pulling it out of the saw each time! That's above and beyond.... Honestly mate - if it's a load of effort don't worry and I can figure it out, you've done enough already.

It’s not a problem, I just want to see the finished product, always had a soft spot for Jonsered/ Jonsereds.