Recent Posts

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Chatterbox / Re: HTTPS
« Last post by Muzzer on June 04, 2020, 01:06:33 PM »
Perhaps you could post a link. Simply adding https doesn't work and most browsers hide the http bit anyway.
Chatterbox / Re: HTTPS
« Last post by scc on June 04, 2020, 12:54:47 PM »
Chatterbox / Re: Sad news
« Last post by Steamer5 on June 04, 2020, 12:51:44 PM »
Hi Bill,
 So sorry to hear of your loss. Take it one day at a time, & I'm sure the hounds will help.

Cheers Kerrin
Chatterbox / Re: HTTPS
« Last post by scc on June 04, 2020, 12:45:13 PM »
Thank you Jo, I'll see if I can manage that :atcomputer: :headscratch:
From Kits/Castings / Re: A Robinson from rejects.
« Last post by Jo on June 04, 2020, 12:29:05 PM »
Our old chemical lab used to reckon that Loctites went on for decades - if it was still liquid it would still set ok. If you are looking to comply with ISO regulations then it should be in date.

Much more likely to be a surface contamination that is causing the joint failure. Try using some industrial acetone on the surface before gluing. If you use Brake fluid cleaner to clean the surface be aware it acts as an accelerant on Loctite.

Chatterbox / Re: HTTPS
« Last post by Jo on June 04, 2020, 12:20:55 PM »
Yes it did. You need to change our address to HTTPS rather than just plain HTTP to see it.

From Kits/Castings / Re: CHUK, yes another one
« Last post by Jo on June 04, 2020, 12:19:24 PM »
I use my collet chuck if I want accuracy, having said that the only battering on my three jaw is because it is 50 years old not and it suffered with coolant water damage over 30 years ago before I owned it not because it cannot hold true :) Something does not need to be perfectly circular to hold it in a three jaw, if the edges are uneven then that is overcome by using aluminium off cuts between the jaws and the casting it won't damage a decent quality chuck.

The Cylinder head is a simple turning operation.

The A frame takes a bit of thinking about: The feet and the top where the cylinder is going to mount have a lot of draft angle on them but it is the sides of the frame that need to be square so that is our surface we use to clamp the frame while milling the bottom of the feet and then turning it over to surface the top. Having taken the casting to height it is then possible to measure what is left and decide where the centre of the cylinder needs to go, this also provides a good indication of what is needed to complete the bottom of the cylinder.

So back on the Colchester to machine the 50.8mm diameter which is going to fit into the A frame and to add that sneaky extra fin that Graham adds to his engines to see if we notice it  :stickpoke:

From Kits/Castings / Re: A Robinson from rejects.
« Last post by Alyn Foundry on June 04, 2020, 12:05:02 PM »
Any thoughts/comments?

I posted a picture of young Alan's " Blue " Robinson, nearly ready for its first run. Needless to say it eventually started but ran rather " fitfully " displaying signs of heavy preignition, knocking, thumping etc.

Upon closer examination we noticed air bubbles periodically bursting at the water base opening, obviously we had a cylinder liner to water jacket breach.

We have always used Loctite 638 for gluing the cylinder liners into place, my 30+ year old replicas are still running soundly after 1000's of hours.

My question, does this particular adhesive have a " shelf life " ? The three of us are currently building a Gardner and two Robinson's and over the last week we all glued up our cylinders. Yesterday Alan removed the liner by bringing up the assembly to just over 200 degrees C, allowing everything to cool slowly before cleaning and re applying the adhesive. I also had just glued mine. After the curing time had elapsed we did a simple mouth to casting pressure test, all 3 leaked.

All the usual preparation procedures were followed, scrupulous de greasing etc. Is the glue out of date?

Cheers Graham.
Chatterbox / HTTPS
« Last post by scc on June 04, 2020, 12:04:38 PM »
Did the switch to HTTPS actually happen?  I am still seeing "not secure" at the top of my padlock.      Just curious that's all.
My Workshop / Re: Alterations to my workshop
« Last post by scc on June 04, 2020, 11:57:36 AM »
The Y axis dial gauge mounting seen in pic 1615 proved to be a little flexible :facepalm2: I have since modified it, as usual a bit untidy, but works perfectly .   The little Raglan mill is now spot on, especially after last year's new leadscrews :)            Terry
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