What Did You Do Today (2017)

[RobboParticipant @robbo]

Cornish Jack

The drive belt on my little Perfecto shaper (5" ) is an A50.

Edited By Robbo on 09/10/2017 23:36:38

Edited By Robbo on 09/10/2017 23:37:09

[RobinParticipant @robin]

Posted by Roderick Jenkins on 09/10/2017 23:16:30:

Please forgive my ignorance in these matters, but that seems like the wrong order to me

A gun has to be in proof if you want to sell it, pawn it or import it. If you only want to shoot it, go right ahead

[John GardenerParticipant @johngardener91897]

Robin, that's correct. The gun arrived in kit form from America some time ago, the barrel wasn't vented so no FAC etc. required. I had arranged a slot on my FAC so was free to enter it as 'manufactured' I plan to use it for charity fund raising events and so it needs proof. I shall be testing it this week-end at Bisley and, if it works, shooting a competition the following week-end. That should be fun. I like shooting because racquet doesn't, club doesn't, cue doesn't, bat doesn't; but gun rhymes with fun!

[Cornish JackParticipant @cornishjack]

Thank you Robbo – my original was there or thereabouts but I'm trying to make it as short as possible for a particular bench installation. I'm sure I've seen a set of related tables on allowable shaft centre distances but can't find it at the moment

rgds

Bill

[SillyOldDufferModerator @sillyoldduffer]

Posted by John Gardener on 10/10/2017 10:46:15:

…

I like shooting because racquet doesn't, club doesn't, cue doesn't, bat doesn't; but gun rhymes with fun!

Only if you believe what happens in Vegas, stays in Vegas…

[David Standing 1Participant @davidstanding1]

Posted by SillyOldDuffer on 10/10/2017 11:58:11:

Posted by John Gardener on 10/10/2017 10:46:15:

…

I like shooting because racquet doesn't, club doesn't, cue doesn't, bat doesn't; but gun rhymes with fun!

Only if you believe what happens in Vegas, stays in Vegas…

Dave, for a whole multitude of reasons, please let us not go any further in this line of discussion on here.

[Ian S CParticipant @iansc]

Bill, you should be able to get the pulleys quite close, and to get a good wrap around the small pulley you could fit a jockey wheel pressing on the slack side of the belt, and 12" wouldn't be too bad, maybe even closer.

Ian S C

[Roger HartParticipant @rogerhart88496]

My expensive hedgecutter started playing up, lousy starting and wouldn't pull the skin off a rice pudding. New plug then fiddle with carb – no change. Now I hate carburetors so ordered a replacement on fleabay £5. Fitted and now runs a treat – result.

But for one thing. When I fitted new carb I found the throttle cable was slack and needed a twiddle on a hard-to-find adjustment to make it OK. So now I am left with the guilty feeling that I didn't need a new carb at all, just to use my eyes and what passes for a brain. Probably all that was wrong was that vibration had slackened the throttle cable adjustment. So should I put the old carb back to verify or should I leave the bl&*dy thing alone.

[Gordon WParticipant @gordonw]

Keep the 'carb, it will come in one day. I love carbs, try fiddling with an injector !

[Involute CurveParticipant @involutecurve]

I do a bit of work for a company that has a few Vapour blasters, these things use a paper roll filter system to remove all the crap from the water, it quite a neat system, so it got me thinking if it would work on my mill, in part because I hate cleaning out the suds tank in the foot of my the mill, to get to the tank I have to climb over it and wriggle my way into the back of the thing, So I knocked one up from 1.6mm sheet I omitted the wears for simplification, and rely on the filter paper roll to do its job, so basically the coolant runs into the tank down a ramp full of 8mm holes and through the paper it then out into the main tank, I ran it for a about 20 mins on full flood to test it on the old coolant which looked ok to be honest, I am amazed how much crap it has removed from the coolant it appears it is removing the tramp oil as well, all I need to do now is make a couple of feet for it.

Pic below and a couple more in my misc album.

[John HinkleyParticipant @johnhinkley26699]

I finally got around to making the four-facet drill grinding jig to go on the Worden T & C grinder I completed recently. Converting the drawings to all-metric took a while, but I admit I've been slacking in the workshop a bit, too. Couldn't leave this design alone, either, so I incorporated what I hope is going to be an "improvement". The original design calls for the drill slide to be tilted to 31° to achieve the desired point angle. The suggested method is to use a protractor or angle plates. I decided to incorporate a sort of sine bar within the design, so that setting the angle would be a one-step operation. By determining the positions of the dowels using the CAD program, I made a silver steel rod of the required length to obtain the angle, exactly. A picture (or two) is/are worth a thousand words ………

      

I think tomorrow might be spent sharpening a few drills!

John

Edit to get the photos side-by-side, I hope.

Edited By John Hinkley on 10/10/2017 17:46:01

[larry PhelanParticipant @larryphelan54019]

Perhaps a bit late in day,but I made up a lifting hoist,based on Dave Fenners. I had to make a few mods,since the ideal material was not available,but it works. When I paint it,I will send a photo,if anyone is interested.

I think it,s the kind of thing which others might find useful in their workshops,if their backs are anything like mine !

[mechman48Participant @mechman48]

Went to local auction Co. For pre- auction viewing of machinery etc, very nice ML10 on offer…. virtually new, very little sign of use on nice cabinet stand, no doubt will fetch a good price, also Boxford model AUD, 3 phase, well used from a college, cosmetically tatty but still in reasonable nick. Got my eye on a couple of small items so we'll see what happens.

George.

[Cornish JackParticipant @cornishjack]

Just an update on my quest for minimum shaft separation for belt drives – the details I recalled seeing were … in my bookcase!! Newnes Complete Engineer Vol 3. Drive centres should not exceed 4 times the largest pulley diameter, unless a jockey pulley is used. Intended installation might just work; otherwise rummaging for a jockey pulley begins

rgds

Bill

[John HinkleyParticipant @johnhinkley26699]

Hi, Bill,

Well done for finding the answer! If you can't find a suitable jockey pulley by rummaging, I bet you've got a few roller bearings lying about the place. I used one as a jockey on the first iteration of my tool post spindle, like this:

The bearing is mounted in a slot to allow for tension adjustment of the belt . I know it's not considered good practice to reverse-bend a Vee-belt, but a) it might get you going and b) not much harm will come to the belt assuming you won't be running the shaper for hours on end.

John

Edit:  Just realised that if you position it closer to the small pulley, it will have the added advantage of increasing the contact arc, too.

Edited By John Hinkley on 11/10/2017 12:52:49

[Ian S CParticipant @iansc]

My idea of a jockey pulley was just that, to increase the wrap around the smaller pulley, this was also the reason for the long distance of 18".

Ian S C

[Gordon WParticipant @gordonw]

Belt jockey pulley- cheapest is from local garage who will have a skip full of timing belt pulleys, most will still be good for your job.

[Cornish JackParticipant @cornishjack]

John, Ian and Gordon – thank you gemtlemen. Useful options there. I have now got an accurate figure for the large pulley diameter – 8" , so 32" ideally centre to centre ; too far!! So looks like it's jockey pulleys to the fore!

Given that Robbo's belt is an A50 – 50" total length (as I understand it), there would appear to be quite a bit of adaptability in the useable belt lengths????

rgds

Bill

[MuzzerParticipant @muzzer]

I suggest you are way overthinking this. The only reason for fitting a jockey pulley is if you can't move the driver and driven pulleys apart to tension the belt. I mean – what's the worst that could happen here? Some wild, uncontrolled resonance that will tear down your workshop? Don't think so.

Look at some numbers. If you look at the Fenner website there's a design manual that tells you everything you'd ever want to know and a lot more besides. On page 40 there's a table that gives the centre-centre distance for different pulley diameters and belt lengths. The third entry down has a pair of 63mm diameter pulleys and a 3550mm long belt. The centre distance in that example is about 1676mm according to Fenner. That gives a centre to diameter ratio of over 26.

Just build the damned thing and stop trying to make life difficult for yourself!

Murray

[Gordon WParticipant @gordonw]

Looking across the fields today I saw black steam loco going down the road, about a mile away. Shook my head and looked again- it was a trailer load of black wrapped hay bales with a hoist at the end. I think it was just accidental.

[HasBeanParticipant @hasbean]

Finally got around to fitting the DRO to my mill/drill after it'd been sat in the garage for ages!

It's not the best bit of work compared to most but it works and I'm more than happy with it

Paul

[duncan webster 1Participant @duncanwebster1]

Posted by Cornish Jack on 11/10/2017 12:07:10:

Just an update on my quest for minimum shaft separation for belt drives – the details I recalled seeing were … in my bookcase!! Newnes Complete Engineer Vol 3. Drive centres should not exceed 4 times the largest pulley diameter, unless a jockey pulley is used. Intended installation might just work; otherwise rummaging for a jockey pulley begins

rgds

Bill

The centres on my Centec belt drive are a lot more than 4* the biggest pulley and it works a treat

[Cornish JackParticipant @cornishjack]

Muzzer – Yep, I'm sure you're right! See below …

Duncan – many thanks, not just for the measurement note but for re-jigging my few remaining brain cells!! "lot more than 4*" Why can one read something and SEE something quite different (in this case the direct opposite!!!) The drive centre distance should not be LESS than 4 x large pulley diam. My requirement is to fit shaper and drive motor on a horizontal surface offering a MAXIMUM of 27" between drive centres. Soooo … methinks jockey wheel it will be.

rgds

Bill – exits, hitting forehead with palm of hand.

[Bob RodgersonParticipant @bobrodgerson97362]

Today I returned home from a three day stay in my local hospital during which I had a three hour procedure to have my abdominal wall rebuilt to cure a massive hernia that occurred following surgery to remove my Gal bladder way back in 1986 pre-Keyhole surgery days.

I can't say it was a pleasant experience, especially since the Morphine pain relief made me feel so sick that I decided not to use it and had to bear a couple of days of agony, however The local hospital (Stepping Hill, Stockport) made the whole thing much better than I thought it would be.

The consultant, ( a Polish surgeon) and the nursing staff were absolutely marvellous landlocked after me well. The small ward I was on had only 4 beds so it was relatively quiet and even the food was good.

How can you fault the NHS.

Workshop activities are off for the next couple of weeks but I have got some CNC video stuff to upload onto You Tube that should keep me occupied.

[Bob RodgersonParticipant @bobrodgerson97362]

Landlocked should read "and looked" Bloody predictive text, I hate it.

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