- Thread starter johnakay
- Start date
johnakay
Member
- Messages
- 1,774
I've bought a 4" 3 jaw chuck (for lathes) going to mount that on a small plate and attached to the bench drill when needed.this will help to centralize the the job part.
so I will need to drill it 1st..6.8mm for tapping out 8mm x 1.25mm.
the 9/16" counter bore what size will the pilot be?
sorry for sounding so dumb but I'm not familiar with this kind of work ..lathes tools etc so please bare with me as I go through this. thank you. john
so I will need to drill it 1st..6.8mm for tapping out 8mm x 1.25mm.
the 9/16" counter bore what size will the pilot be?
sorry for sounding so dumb but I'm not familiar with this kind of work ..lathes tools etc so please bare with me as I go through this. thank you. john
wyn
Member
- Messages
- 3,733
- Location
- Cardiff
An M6 counterbore would have a 6.4mm pilot and cut up to 11mm diameter.
That might be the closest to the 6.8mm hole you are drilling if the 11mm is enough for the job.
It might be a case of having the pilot on an M8 counterbore turned down to fit....one of these will cut 15mm diameter.
That might be the closest to the 6.8mm hole you are drilling if the 11mm is enough for the job.
It might be a case of having the pilot on an M8 counterbore turned down to fit....one of these will cut 15mm diameter.
graffian
Seer unto the end of his beard
- Messages
- 3,811
- Location
- gatwick
You could buy one with a removable pilot, 5/8+ diam and a 1/4 pilot would probably do the job. Page 133 of the J&L cat. If you need the pilot to be nearer 17/64, then your going to have to make a pilot or pilot drill first.
How many of these things do you have to do?
How many of these things do you have to do?
John,
This is the best advice i can give you. Sometimes trying to be self sufficient isn't always the way to go. It's now 5 weeks since you started this thread and no closer to resolving the problem. In all honesty i very much doubt you will solve it without getting the right tool made by a cutter grinding company. I can put you in touch with one that can make the tooling you require, but it wont be cheap. Years ago these types of shops were plentiful and getting special tooling made was not a problem, sadly it is now a big problem for all of us in the trade, including me.
I cant imagine you want to try to locate this tooling just to do ten of these, so the first question is as already asked is how many of these do you need to do? If it's quantity and you will be making some money out of it, this is the way to go:
You want to find someone with a machine called an 'emi mec E' these are single spindle automatic capstan lathes. A machine like this will produce what you want, cut to length square and machined faces on both ends, a chamfer each end of the job on the outside diameter, your drilled and tapped 8 MM thread and counter sunk so its all neat, tidy and central central with no sharp corners. I have one of these machines so that's how i know it's the way to go for your job if you have quantity to do.
The thing you have to keep in mind is being self sufficient is all very well and good, if the job is earning you money then its about getting it done in the most efficient and cost effective way. These machines for simple jobs like yours are very cost effective indeed. The time it will take you to produce one part, an emi mec could produce some 15- 20 parts plus. Again if its an earning job then its not an effective use of your time. In addition you will wear your special made tooling out pretty fast in comparison to a machine tool.
The way you intend to do it takes one snatch of the tooling or a part to slip and its wrecked and lost its edge and you are back to square one. You wont have full coolant flow so again premature wear on the tooling.
Sometimes if its about trying to make a few quid looking at other options is the answer.
My kind regards,
Scott (ward engineering)
This is the best advice i can give you. Sometimes trying to be self sufficient isn't always the way to go. It's now 5 weeks since you started this thread and no closer to resolving the problem. In all honesty i very much doubt you will solve it without getting the right tool made by a cutter grinding company. I can put you in touch with one that can make the tooling you require, but it wont be cheap. Years ago these types of shops were plentiful and getting special tooling made was not a problem, sadly it is now a big problem for all of us in the trade, including me.
I cant imagine you want to try to locate this tooling just to do ten of these, so the first question is as already asked is how many of these do you need to do? If it's quantity and you will be making some money out of it, this is the way to go:
You want to find someone with a machine called an 'emi mec E' these are single spindle automatic capstan lathes. A machine like this will produce what you want, cut to length square and machined faces on both ends, a chamfer each end of the job on the outside diameter, your drilled and tapped 8 MM thread and counter sunk so its all neat, tidy and central central with no sharp corners. I have one of these machines so that's how i know it's the way to go for your job if you have quantity to do.
The thing you have to keep in mind is being self sufficient is all very well and good, if the job is earning you money then its about getting it done in the most efficient and cost effective way. These machines for simple jobs like yours are very cost effective indeed. The time it will take you to produce one part, an emi mec could produce some 15- 20 parts plus. Again if its an earning job then its not an effective use of your time. In addition you will wear your special made tooling out pretty fast in comparison to a machine tool.
The way you intend to do it takes one snatch of the tooling or a part to slip and its wrecked and lost its edge and you are back to square one. You wont have full coolant flow so again premature wear on the tooling.
Sometimes if its about trying to make a few quid looking at other options is the answer.
My kind regards,
Scott (ward engineering)
John, there would be no need for you to do any of the work at all. The machine will produce a finished part parted to length, drilled, tapped and chamfered if required. Its one hit machining with machine tools like that.
Most people with a machine of that type normally work on a minimum quantity of 100 parts depending on the part complexity. Your part is very simple.
The cost in doing a job like that is in the machine setting and not the actual part cost with low run volume. If i was asked to quote a job like and the material as in stock, you should expect to be charged about 50 - 70 quid for the job complete.
Kind regards,
Scott ( ward eng)
Most people with a machine of that type normally work on a minimum quantity of 100 parts depending on the part complexity. Your part is very simple.
The cost in doing a job like that is in the machine setting and not the actual part cost with low run volume. If i was asked to quote a job like and the material as in stock, you should expect to be charged about 50 - 70 quid for the job complete.
Kind regards,
Scott ( ward eng)
