If you have been affected by any of the issues in this post or need CNC Counselling then contact me. then the poor old machine doesn’t have much time to get up to speed. So don’t forget if you are starting at Z1. The bigger you make this Z figure the more time your machine will have to get up to speed. You know that old book that you use to prop the door open The machine will have a maximum feedrate and it will be in the manual. I can’t give you exact figures for this, not because I can’t be arsed but because it will vary depending on your machine. This start point distance is really important because it will allow the machine to get up to speed. This will all depend on the age of your machine but you must always make this calculation just in case your trying to cut a thread at the speed of light. If you have a coarse pitch thread in aluminium you probably will end up with a super high feed-rate you can’t even achieve. The faster you go and the courser your thread pitch the quicker the machine will have to feed. No not really, well it is good for you but it’s not what I meant. Now I need to feed at 6000 mm per minute so this pitch problem will be twice as bad. Strange BehaviorĮver had a thread where you can’t get the gauge on then suddenly it goes on only to find the thread is really loose further down? If it does not accelerate quick enough you will get a pitch error, your thread will be wrong. Therefore in that 3 mm the machine has to accelerate up to 3000 mm per minute. So at the start of the thread you have 3 mm of clearance (Z3.) So the machine will be feeding at 3000 mm per minute along the thread. The spindle starts at 1200 rpm and the feedrate (which in the case of a thread is the pitch) is 2.5 mm per rev. This is my puppy his name is Donald he is learning to program a G71 woofing cycle. If you don’t know what ruminating means then maybe you shouldn’t be reading this article. Spare a thought for people like me who lie awake at night ruminating about these things. Now let’s think about how far in front of the part you need to be with the threading tool. Front Clearance (G76 threading start point) Of course if you have a Siemens control Sinumerik 828 840D then this does not apply because you have to specify if the thread is internal or external in the cycle. So be careful because you might not notice that tiny amount. If you don’t do this then your tool will try and cut away from the 20 mm diameter. Therefore you must first position the tool outside that 20mm diameter. This thread has a core diameter of 16.96 ( X16.93) the thread depth is 1.535 (P1535). Here is a example of a 20mm external thread. The tool will work from this position backwards. So providing the tool is initially placed outside of the maximum diameter it will do exactly what you want. If you do this the machine thinks the thread is internal and therefore cuts backwards. I had the tool just below the external diameter of the thread. Your start point needs to be inside or outside the thread. Well that’s how the machine knows whether you want an internal or external thread. G76 threading start point how was it wrong? What to do Next?Įverything rushed through my head, senile dementia, flashbacks from a misspent youth, did I feed the dog?Īnyway I suddenly realized I didn’t have a dog and that the start position of the tool was wrong. It was cutting an external thread but the tool was working it’s way outwards. Anyway I couldn’t get it to perform a G76 threading cycle. This is the position you rapid the tool to just before you call the G76 threading cycle.įor example how does the control know if you are producing an internal thread or an external thread.Īctually I learnt this the hard way. Please select Afghanistan Albania Andorra Angola Anguilla Antarctica Antigua and Barbuda Argentina Armenia Aruba Australia Austria Azerbaijan Bahamas Bahrain Bangladesh Barbados Belarus Belgium Belize Benin Bermuda Bhutan Bolivia Bosnia Hercegovina Botswana Bouvet. We also have integration expertise with a market of vendors.G76 threading start point, when you use a G76 threading cycle on a CNC Lathe the position that you start the tool at is really important. Our platform unites all your corporate wellness programs - including health assessments, biometrics management and health content management, challenges and digital behavior change programs, coaching, incentives, communications, and social tools - into one place. This, along with our world-class support helps to grow great wellness businesses. CoreHealth's all in one, white-labeled platform for wellness allows for the greatest flexibility, customizations, and integrations of any software. 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