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thanks guys, I will take on board what you are saying. I agree mild steel is a bad idea.

Thanks guys, The reason I was asking is because it was suggested to use this as a fixture and clamps used in a heat teatment process to remove distortion. It was suggested that this material would be used as a base fixture to locate a nickel alloy ring onto, and also use the steel material as...

Hi, Does anyone know the thermal expansion rate at 1000°C on Carbon steel. A rough figure will do.

The rings are essentially finished components therefore dimensionally they will have to be good when the come out of the oven. The error is in the roundness. I was thinking that as the part will be located onto the diameter of the fixture it will be essentially be one body, and the heating and...

Thanks guys, I think I have the calcs now. Some of the guys have been talking about supporting the part through fixturisation. That is something that I am looking at for a thin ring that I am trying to make round again. I have a ring that is OD 1000mm ID 950mm and L 5mm. It is out of round and...

Hi, I am wondering how to work out the thermal expansion calc of a ring with OD 1000mm and ID 800mm and L20mm. I I am heat treating a nickel alloy ring at 1000°C and I am wondering how much the ring will grow at the OD, ID and L at this temperature. I am only looking for a rough estimation...

Thanks for that. This was one of the websites I found info on, but its still quite open- Poisson's Ratio- 0.27-0.30 and Elastic Modulus 190-210(GPa)

The heat treatment condition wont effect the modulus though? This will remain constant at room temperature regardless of condition. I have compared against Inco718 and it falls within the ball park, but I was hoping that someone may have some info on this alloy as there is not a lot of info...

Hi Guys, I was wondering if anybody knows Youngs modulus and Poissons ratio of Nimonic C-263. I have found a range of information but finding it difficult to determine anything definitive.

As the elastic modulus of Titanium(6Al4V) is lower than steel, will this produce more material movement when manufacturing components. For example, if I was machining/ heat treating/ processing a thin walled typical aerospace component from Titanium, would it tend to distort and move more...

So, I would be carrying out 16 experiments? Before the experiments would I determine a low and high value to test at? ie. feed 0.05mm/rev low 0.25mm/rev high, doc 0.1mm low 1.0mm high, speed 50m/min low 300m/min high, carbide low ceramic high Also, what I am not quite sure of is if all...

I should note that the residual stress will be getting measured using X ray diffraction or hole strain gauge method

Hi, I am looking to carry out turning machine trials on steel, using carbide and ceramic inserts to determine residual stress profiles, using a design of experiments framework. I am not overly familiar with the complexities of design of experiments and was hoping that someone could point me in...

The elastic modulus of grey cast iron is relatively low (approximately half that of steel and almost the same as titanium) and I was wondering why this is, considering that cast iron is particularly brittle. When dealing with titanium in a machining environment the material tends to move/...

ornerynorsk- what size range was the fixturing that you utilised in 4140. Was it large or small?

The reason I asked is that it has been previously specified for a fixturing application which is reasonably large, 1000mm outside diameter and 800mm inside diameter. I only reason I can think why it has been used as it is stable??, but as it would be coming into contact with surfaces of other...

I am a little confused as to the properties of cast iron. Generally in materials when the hardness increases there is a reduction in toughness, and vice versa. In cast iron the material is very brittle yet the hardness/tensile is also very low. Can you explian this? Also, one of the...

There are bushed 20mm holes at 100mm pitches- this is what we use as location. We then bolt down with capscrews. The size of the plate matters as the next fixture could be twice the size. We make use of most of the hole pitches. Why do you say that you wouldnt use cast iron as its spinning? Is...

I am looking for fixturing up to 1000mm. Does tool steels D2 and O1 come in this size and are they expensive. I would imagine D2 with its high alloy content would be more expensive

arunmrao-Can you remember what alloy steels these were? I have attached a picture of a typical base fixture with a part specifc fixture attached and then a component attached to that. The base fixture ranges from 500-1000mm and is standard on all of our machine tools(cnc lathes and machining...