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You can try for a tight press fit and finish ream after. If you use adhesive, check with the data sheet on clearance need for the best result, some types work better with a looser fit. I would avoid the ‘half and half’ axial pin on gears this small. silver solder is messy but if the flux is only...

I anyone wants a set of gears for this or any other application, I can hob them for you and post worldwide. Peter

Peter Back to the pipes, you could try Cerrobend inside commercial tube.

Try Edwards Metals, in Birmingham, Abbey Spuncast in Willenhall or Keatley also in Birmingham. All do mail order. peter

All hobs are rack form but the problems are with tooth relief and driving the hob and blank in unison, ’free’ hobbling does work but you need a blank much wider than the gear is to be to allow the hob to engage as the edge of the teeth are often damaged. if you wish to make gears without a...

If you prefer, I can hob the gears for you, it will be a lot cheaper as I have the hob and the tooth form will be better. PM me if you are interested

It is difficult to make a recommendation without knowing your budget, the type of work you plan to do and your ability. for my pennies worth, I would go for plenty of iron, a heavier machine will will hold its accuracy better, quill drilling is nice but a stand alone drill is much better, a...

When melting aluminium beware of iron, if the scrap includes screws etc or if you use an unlined steel melting pot, the iron can leech into the metal causing it to go very sluggish an impossible to work with. A good source of metal scrap is old car engine pistons they are pretty iron free and...

Go to scientific601,this will enable you to pick any pitch from your set of gears

You can certainly hob helical gears using standard hobs but you need to be able to adjust the relationship between the feed and rotation of the workpiece, not all hobbers have this feature

if you want a crude but simple temporary solution try this, get a blank taper arbour and put it into the tailstock, mark the top of the arbour so you can put it back in the same position. fit a centre drill to the headstock then drill and tap the arbour in the tailstock to take a screw in drill...

Yes overlap, you can use a circle of abrasive paper glued to the disc and slightly angle the spindle. Look up ‘Engine Turning’

For lathe work I use a pin chuck. You put the shaft into the normal tailstock Chuck just loose enough to turn, almost as though the shaft is running in a bearing, you then get the lathe going and feed the pin Chuck forward by gently holding it between your two forefingers with the rest of your...

With jobs like this remember that although it is your hobby this is still a business transaction. If you charge too little you will be expected to be a cheap source in the future, too much and you won’t get further work. look at it like this, material + tooling + time, never work for less than...

I can make them for you on my gear hobber, the long part of the job is doing the calculactions for the gear trains and I do have a lot on just now so you would have to be patient!

I notice that you have had no responses to your post so here goes, I am not familiar with the method you are using but I think the helix at the tear of the mandrel is to turn the work as it advances. i would look at 3 areas, 1 are you using the right cutter Too low a tooth count will be too...

You could try and find the black wax used to fill the engraving on brass clock dials, you warm the dial (rule) and wipe the hard wax on, allow it to cool down then rub off the excess with abrasive paper and finally warm again to remove scratch maris.

I have thought about making hobs for non standard pitches, if you look at Ivan Laws book on gears, there is a description of the Eureka a tool for making your own involute cutters for ‘one tooth at a time’ milling, I think the attachment could be adapted for hob making by feeding the cutter...

Three options, move the keyway, I think this not going to be too good as boss will be weakened and will fail machine out the inside and replace with a bush, if you make a step on the bush and corresponding one in the bore you get good location, hold together with screws and glue. make a new pair...

When reading an old edition of Model Engineer from 1902, in the days of treadle lathes, I came across a piece on making metal piston rings which might be relevant today. The method was to rough turn a tube with the od too large and bore too small this was then faced across one end and a...