Feb. 2017

Bluewater Bulletin

Bluewater Model Engineering Society Sarnia, Ontario

Vol. 32 No.4 January 2017 Editor John Lovegrove

Our next Meeting will be on

Monday February 13th, 2017 @ 7:30 pm

Northern Collegiate Machine Shop (Rm. 148), Indian Road, Sarnia.

The January Meeting

the numbers to embarrass him but I’m sure Brian won’t do that again. To add insult to injury, the map is now slightly torn!

Brian and his map

Unfortunately I was not at the meeting so this newsletter has been prepared using notes and photographs supplied by Bruce Mannerow. (In fact "unfortunately" is probably not the right word because I was away in Vermont enjoying the skiing.)

What was more unfortunate was that there were only nine members present. Bad weather in the London area probably kept people from that direction away.

Continuing on the unfortunate theme, like various sports organizations we now have a club injury list: Kasey Schuilenberg came off second best when he was up a ladder doing some jobs and the ground suddenly came up and hit him. The result was a broken hip and some time in hospital. Apparently he is now back home, getting around with the help of a cane. Martin Beales had his moment of horror on his stairs when his left foot took two steps down while his right foot took none. He sat on it and the ankle could not take the strain. Anyway he seems to have had his money’s worth out of OHIP because it was X rayed and set in a cast in Newbury then there was a repeat performance when he was taken into the Hamilton Hospital. At the time of writing his broken ankle was still in plaster. We wish them both well.

Kasey’s accident reminds me of rules that came into place during my last few years at work. Most if not all companies in the valley essentially banned working from ladders because of the accidents that have occurred. Overhead work now requires use of scaffolding or one of those man-lifts. (It’s a pity these things are out of the reach of individuals cost wise because there are numerous occasions when I could have made use of one.)

Workshop Tips

Bruce gave a 5 min "hint" that was picked up from the Joe Pieczynski website. (He does not seem to know how to pronounce his name either because he just calls himself "Joe Pie".) It is about centering square stock easily in a 4 jaw chuck. The usual method is to put an indicator on one of the square stock sides and find the high point, then move the indicator off, roll the chuck 180 degrees and repeat. The jaws are adjusted and the procedure repeated on the other two sides. This is a slow process because one has to move the indicator out of the way to rotate the chuck and then move it back in and find the new high spot.

Slow way

Show and Tell

There were no actual model engineering items but Brian Lawson did bring along what is now the world’s most expensive map of Bothwell. The story is that he went to Staples to have the map printed and told them to use whatever was in the machine mistake it turned out to be their most expensive! I won’t publish

Joe’s method is to place a small piece of metal about 1/8" thick on each of the sides, holding them all in place with a rubber band. They need to stick out about ¼" past the end of the stock. With the indicator tip facing up on the inside of the small pieces, the chuck can be rotated without moving the indicator. Finding the high point is now quick and easy. Bruce tried it and it apparently works.

Better way

John has not been able to get to the meetings recently because his wife has been un-well. However, he has promised to bring the T shirt along when he can come next.

It looks as if this is the best way to go. If we are happy with the quality it is very cheap to apply to a T shirt or maybe other garments. (You could even add your name, telephone number and anything else you want everyone to know about!) Just paste the logo into Powerpoint, add what you want, flip to give the mirror image required then get the iron out.

O Ring Sizes

A while back I included a note about O ring sizes: If you take what industry regards as standard North American sizes, the actual cross section of the ring is slightly larger than the nominal. For example a 1/16" section ring is actually 0.070", a 1/8" ring is actually 0.139", and so on.

However, if you go into Harbor Freight or Princess Auto you can buy boxes of O rings quite cheaply (made - you can guess where) and the quality looks OK. The problem is the sizes do not correspond with the standards we are used to. As far as I can see the actual cross section is the nominal size.

The real watch-out is using them to replace an existing O ring. If the housing was designed for the normal standard, there may be insufficient crush or squeeze to form a seal. If starting from scratch one just has to adjust the housing size appropriately.

Taking % crush and groove width recommended in the normal O ring charts then scaling to use with these other O rings, I put together the following table:

Several years ago I bought a 5C collet chuck and this has proved to be one of my most worthwhile purchases. I also bought a set of square collets to go with it and while they do not get used very often, when I do need to machine something from standard size square bar, none of this carful setting up is required.

Bruce also talked about the pantograph that Joe "Pie" made and passed around a copy of the plans. It is used with a low cost air driven die grinder instead of belting up to a motor. This is a pretty simple setup but it works very well. He now has plans available through this link:

https://www.youtube.com/watch?v=oAl9wT13xXc

If anyone wants a set and can’t download them please let Bruce know and he will get the plans to you.

The Club T Shirt Saga

After sending out the last newsletter John Sibbick sent me an e-mail showing what he had managed to do using one of the iron-on transfers from Staples.

Proposed Club Logo

Our Website

https://sites.google.com/site/bluewatermes/

The TSME Newsletters

https://sites.google.com/site/tsmeweb/the-modeller

Meeting Schedule for the remaining 2016- 2017 Season

2017

February 13th

March 20th (13th is March Break)

April 10th

May 8th

June 12th

John Lovegrove