Member postings for modeng2000

Water hot enough, above 55 degrees Centigrade to stop bugs breeding in the heated stored water.

John

Dell, I also am interested in modifying the hall control to a pot.

I expect there are several others out there as well.

Regards, John

Magnetism is good.

Brilliant

Howard, having spent some time making this holder and realising some of its short comings I have concluded the Eccentric Engineering design is probably the optimum for such a tool holder.

The reason for silver soldering pieces together is because of my limited machinery. Achieving the compound angles used by the Eccentric holder is something I could not visualise with my equipment so the job was divided into managable sections.

i am quite surprised by the strength of a good silver soldered joint. I would have no concerns about using this method again.

John

I think a polish up would make a lot of difference.

Quite a complicated machining procedure as I only have a mini-lathe with a milling crosslide vice these days. Still it was an interesting experience.

John

This is a rather rough tool holder made roughly as I have been describing.

It is not very pretty but it cuts mild steel like magic. I think because I wanted to prove my idea that I rushed making it not as refined as I would have liked. Machining the V grove was a difficult set-up because of the combination of three angles. The only way I could do this was to machine the grove before bending the holder, this removes one of the setup angles. Another point I would do differently next time is to have the bolt head on the other side of the holder.

Hope this inspires others to have a go.

John

Really useful information Oldiron, thanks for when I might need it.

John

Hopper, I can understand where you are coming from. Belt and braces is often a good maxim but I think this time it is a bit too cautious.

Hopper, I took on board your advice that a silver soldered joint would not be strong enough to withstand the forces involved in cuting especially intermittently. So I made a joint between two bits of 1cm square mild steel bar. Putting one end in the vice and a lever on the other end, I could feel the bar flexing but the joint remained sound. I couldn't apply enough force to break or bend the bar or joint.

So I'm going to continue with my approach in the knowlege that it will produce a strong tool holder.

John

Michael, thanks for the photo. It is a much simpler version from what I first had in mind.

It is obviously the way to make it.

John

Thanks Hopper, I now have a better idea of what I'm trying to do.

John

Howard, Thanks for your input. A slot might be possible but it would have to suit the tool bit dimension while a V does not require a sized slot drill. I have tried to avoid a slot design for this reason.

Having tried various mock-ups it has become obvious that I can not make what I want from a 12mm square bar. I shall have to do as Jason suggested and cut the shape from a piece of 12mm thick strip.

Thank you all for this discussion, it has really helped me to understand what I am trying to do.

John

Hopper, I want to drop the head down so the tool bit is at a suitable height as per the Eccentric holder.

I have made a holder using the square hole method I described and it is fine. The problem is the tool bit is really too high leaving no room for adjustment. I really should reduce the shank thickness but unfortunately this holder does not have the off-set angle that the Eccentric diamond holder has.

Adding a drawing or photo isn't possible just now.

John

Yes Paul, I can get a depth approaching the longer measurement having bent the 12mm bar to achieve this.

It won't be an exact copy but hopefully something near enough. Time will tell.

John

I am trying to copy the shape of the Diamond Tool Holder. This seems to be the definitive shape and it has a lot of users. I used to have one but it went when I downsized my workshop, regrettably!

Regarding the clamping method, I want to make a system that I can satisfactorily put together. So I have been looking at the various ways folk have used and taking into account my ability to cut metal the farrication method works best for me. The only milling I can do is on the lathe and so set-up is not as easy as on the mill I used to have.

John

Jason, the square hole would be split so that a clamping screw pulls the slit closed to hold the tool bit.

This is really the same as having a separate clamp piece when gripping the tool bit.

John

Nick, the hole is 1/4" square. Your filing abilities must be better than mine as having tried filing a square hole I was not satisfied that a lathe tool would be held securely enough. So this is why I fabricated the making of a square hole.

John

I am having another go at making a diamond tool holder. my first problem was how to get a square hole. Well I fabricated it from two V shapes quite sucessfully. Broaching is quite out of my ability.

So now I want to progress on to a good shape for the main body of the holder. I am going to try cutting at 22.5 degrees in one plane and a similar angle on the adjacent side. The aim is to leave a bridging piece that will be bent so holding the two halves together prior to soldering. There will might be a need for a shim to fill the saw cut if the two halves do not come close together.

I know that there have been plenty of designs for this type of tool holder but I've not seen one made like this. So here's hoping for a good result.

John

Ady, thanks I don't want to loose the square of the bar at the bend. I am going for a partial cut removing a wedge and then close up before silver soldering. I may need a shim to take account of the saw blade width.

John