Member postings for ian j

I have a Kennedy model "90" hacksaw, which is much larger than the "60" (Hex bars are 21mm AF)

I've never managed to get the flat belt to run on the centre of the large pulley.

So seeing Graham's Poly belt conversion I decided to do the same to mine.

Been a larger machine the dimensions are different to Graham's.

Large pulley diam. 9.875" (251mm)

Small pulley diam. .96" (24.38mm)

Centre distance of pulleys 6.8125" ( 173mm)

Graham very kindly calculated the Poly belt length as 34" ( 864mm)

This was purchased from "Simply Bearings" Part No. 864PJ/340J-14Rib

As can be seen in the photo the belt now runs nicely on the centre of the large pulley and is far easier to put on than the old flat belt.

Same with my copy purchased today from my local news agents , only my free " Heritage Railway" magazine was November 1999 !

Ian

Edited By ian j on 14/07/2023 22:36:52

Diane.

I've used these people in the past.

Modern Engraving Stoke On Trent

Hi Graham.

I have this one in my favorites, not a youtube one but plenty of photo's and construction detail.

Down on The Farm Boy

Ian

Edited By ian j on 11/06/2023 20:07:35

Edited By ian j on 11/06/2023 20:12:45

Thanks for that information Rod. I will give it a try. I've only used CamCalc once before for the JH V 4 cam shafts, will have to see if I made any notes.

I may be back !

Graham.

I also have built the JH Farm Boy (two). Another enjoyable build, be prepared for mountains of swarf. I used the minimag ignition system.

Ian

Graham.

I had read the RCEXL data sheet regarding timing and then completely forgot it and followed Andrew Whale's youtube video!

I'm also running on unleaded petrol with a drop of two stroke oil.

Regarding the fuel tank; It's just a 75mm length of 50mm diam thick walled brass tube I had, with ends, filler hole and outlet soldered on ( if I was making it again I would make it longer and have the supporting struts spaced further apart as it is easy to catch the supports when starting with the drill) It's mounted so the fuel out is level with the carb fuel in (180mm from base on mine) The supporting struts are just 10mm x 25mm aluminum angled at the bottom by 5* so they leans out, with the "pockets" milled 2mm deep and then sprayed satin black, (similar to the rails the engine sits on.)

Now I know it runs I may try the JH 2 jet carb again as they took some time to make.

After all the discussion we had regarding the cam shaft I notice the right hand cylinder exhaust lifter hasn't the same amount of travel as the left hand cylinder. I may remake the cam shaft but don't fancy the Cox method again. So ROD do you have the parameters you used for CAMCALC please?

Graham did you sort out the one cylinder running cooler than the other?

I've enjoyed this build and the exchange of information from members with far more experience than me. I think 3 out 3 engines running is a good result.

What's next?

Ian

Graham.

Thanks for the link for the carb. from Steve Webb.

The S2535 you bought was out of stock, but they had S2530 which is still 6mm bore, just the needle valve isn't at an angle.

Any way with it fitted the engine now starts and responds to the throttle, so I'm very happy.!

One thing I noticed when setting the ignition timing for 10* BTDC the hall sensor was at the quarter past position but I noticed on yours and others it was at the half past position the engine was difficult to start and run when I rotated the hall sensor to the half past position it was a big improvement. I now have it in that position and it reliably starts and runs.

Hoglet V twin

Edited By ian j on 30/05/2023 23:21:27

That's brilliant Graham. Seems to respond well to the carb, Which one are you using?

Well some progress today. After putting to one side for a couple of weeks, I revisited the Hoglet today and managed to get it to run (in a fashion) Using the JH 2 jet carb and Colemans camping stove fuel . It runs very hot and is impossible to restart until it cools down.

I tried to embed the youtube video but failed.

Hoglet V twin engine first run on youtube

Edited By JasonB on 08/05/2023 06:56:58

Hi David.

I've uploaded YOUR drawing for you here.

Ian

Edited By ian j on 24/04/2023 18:53:38

Graham.

The way mine is, looking from the front (gears facing you)

39* position North facing, Left hand cylinder.

120* position South facing, Right hand cylinder.

I can get mine to fire but not run. I think it's the carb, I've tried the Jerry Howell one I made and one off a small RC aero engine.Tried with Coleman's camping stove fuel and normal unleaded with no success.

Ian

Well done Rod, it looks and sounds fabulous, You must be very pleased with the end result.

I must revisit mine as I now have the ignition. To be honest I've been holding back to see how you got on.

I need to make a starting dog and Hall sensor attachment. I've made the Jerry Howell two jet carb. (made two as the

same carb is used on his V4 engine which I need to get back too as well!)

Ian

Edited By ian j on 10/03/2023 22:59:21

Just found these on Ebay

Abrafile clips

Ian

Edited By ian j on 08/03/2023 23:12:44

Graham.

I followed your advice and gave them a call. The ignitions are in stock ( web site just not updated) Got one on the way and the fun trying to get the engine to run starts then !!

Thank You

Ian

Hi Graham.

Can you just confirm the "Just Engines" web site that shows the V twin ignitions are available, because when I look it says they are out of stock.

Just Engines

Ian

It's looking good Rod.

I finished mine some time ago, but having trouble sourcing the RCEXL V twin ignition, They are out of stock at "just engines". Plenty of the single hall sensor ones available but I can't find the two sensor type .

Just to add I secured the crank pins on mine using grub screws threw the the crank webs.

Edited By ian j on 29/01/2023 22:09:53

Mike.

I like this setup so much I'm planning to build two for my 4" rotary tables both fitted with stepper motors and Steve Ward controllers. By studying your excellent photo's I think I get the general idea. I'm guessing you used a 2 : 1 ratio on the toothed pulleys? What size did you use ? MXL type ? number of teeth? Belt length?

Ian J

Edited By ian j on 13/01/2023 16:38:43

Edited By ian j on 13/01/2023 17:34:08

David.

When I measured the barrel with a digital caliper I measured 1,115" like you I thought it was a odd ball size but pot it down to me so rounded it up to 1.125", Just measured it again with digital micrometer and get 1.114". I suppose it's just has to be a nice clearance fit in the tailstock casting.

Ian

Mike.

Looks very good. Did you 3D print the back cover or buy it? If you bought it could you point me in the direction of where from. I've found sites where you can down load the files to 3D print it, but as I don't have a printer that's not an option.

Ian J