Long absence on here so hope you done mind me just popping in with a
question.

Need to mill out or engrave out some text in an aluminium plate and wonder
if anyone know the standard spindle speed for such as the model A?

I am guessing it is the 5,000 rpm mark if not a bit more, so wondering what
type of results I can get with a max of 1,600, just need to reduce feed
rates I guess.

Not having a manual, if anyone could also point out what shape profive I
should use, having seen some 30 degree cutters at 3.2 mm dia from Japan or
China I could fix the pin drill in the chuck if these would work.

If anyone here in the Blackburn area with the capabilities to save me some
time please get in touch as I need to have a VIN plate done.

Cheers

Adrian

David Littlewood wrote:

> In article <h59ha7$pur$1@aioe.org>, Adrian
>  writes
>>mikecb1 wrote:
>>
>>>>
>>>> Need to mill out or engrave out some text in an aluminium plate and
>>>> wonder if anyone know the standard spindle speed for such as the model
>>>> A?
>>>>
>>>> I am guessing it is the 5,000 rpm mark if not a bit more, so wondering
>>>> what type of results I can get with a max of 1,600, just need to reduce
>>>> feed rates I guess.
>>>>
>>>> Not having a manual, if anyone could also point out what shape profive
>>>> I should use, having seen some 30 degree cutters at 3.2 mm dia from
>>>> Japan or China I could fix the pin drill in the chuck if these would
>>>> work.
>>>>
>>>> If anyone here in the Blackburn area with the capabilities to save me
>>>> some time please get in touch as I need to have a VIN plate done.
>>>>
>>>> Cheers
>>
>>Thanks Mike
>>
>>It is a Chester champion mill with CNC fitted and yes slow spindle speed,
>>could you let me know what type of cutter you would use, would a 20 degree
>>cutter or slightly wider say 45 degree cutter be OK?
>>
>>Adrian
> 
> See: http://www.hemingwaykits.com/acatalog/Speed_Increaser.html
> 
> Not made this unit, but it sounds as if it should be an ideal long-term
> solution for you.
> 
> David

Thanks David, but unfortunately just after short term fix.

Cheers

Adrian

Adrian wrote:
> David Littlewood wrote:
> 
>> In article <h59ha7$pur$1@aioe.org>, Adrian
>>  writes
>>> mikecb1 wrote:
>>>
>>>>> Need to mill out or engrave out some text in an aluminium plate and
>>>>> wonder if anyone know the standard spindle speed for such as the model
>>>>> A?
>>>>>
>>>>> I am guessing it is the 5,000 rpm mark if not a bit more, so wondering
>>>>> what type of results I can get with a max of 1,600, just need to reduce
>>>>> feed rates I guess.
>>>>>
>>>>> Not having a manual, if anyone could also point out what shape profive
>>>>> I should use, having seen some 30 degree cutters at 3.2 mm dia from
>>>>> Japan or China I could fix the pin drill in the chuck if these would
>>>>> work.
>>>>>
>>>>> If anyone here in the Blackburn area with the capabilities to save me
>>>>> some time please get in touch as I need to have a VIN plate done.
>>>>>
>>>>> Cheers
>>> Thanks Mike
>>>
>>> It is a Chester champion mill with CNC fitted and yes slow spindle speed,
>>> could you let me know what type of cutter you would use, would a 20 degree
>>> cutter or slightly wider say 45 degree cutter be OK?
>>>
>>> Adrian
>> See: http://www.hemingwaykits.com/acatalog/Speed_Increaser.html
>>
>> Not made this unit, but it sounds as if it should be an ideal long-term
>> solution for you.
>>
>> David
> 
> Thanks David, but unfortunately just after short term fix.

Bodge time!

If you have a dremeloid and a little ingenuity, you can mount it next to 
the millhead - after all, it doesn't have to be inline with the spindle, 
just parallel to it - and for engraving, even roughly parallel is enough.

One tip, the up position should be a little higher than normal as a 
dremeloid will typically have a bit of lengthwise slop.


-- Peter Fairbrother

On Aug 4, 3:41 pm, Adrian 
wrote:
> mikecb1 wrote:
>
> >> Need to mill out or engrave out some text in an aluminium plate and
> >> wonder if anyone know the standard spindle speed for such as the model A?
>
> >> I am guessing it is the 5,000 rpm mark if not a bit more, so wondering
> >> what type of results I can get with a max of 1,600, just need to reduce
> >> feed rates I guess.
>
> >> Not having a manual, if anyone could also point out what shape profive I
> >> should use, having seen some 30 degree cutters at 3.2 mm dia from Japan
> >> or China I could fix the pin drill in the chuck if these would work.
>
> >> If anyone here in the Blackburn area with the capabilities to save me
> >> some time please get in touch as I need to have a VIN plate done.
>
> >> Cheers
>
> Thanks Mike
>
> It is a Chester champion mill with CNC fitted and yes slow spindle speed,
> could you let me know what type of cutter you would use, would a 20 degree
> cutter or slightly wider say 45 degree cutter be OK?
>
> Adrian- Hide quoted text -
>
> - Show quoted text -

Adrian

I don't claim to be an expert on engraving, but for soft materials
like alumium I usually use cutters with an included angle of 30 or 40
degrees, truncated according to the required width of the lettering.
For the small stuff I do, handwheel dials and the like, I usually
engrave 6-8 thou deep.

HTH

Mike

"Adrian"  wrote in message 
news:h57h0f$nfu$1@aioe.org...
> Long absence on here so hope you done mind me just popping in with a
> question.
>
> Need to mill out or engrave out some text in an aluminium plate and wonder
> if anyone know the standard spindle speed for such as the model A?
>
> I am guessing it is the 5,000 rpm mark if not a bit more, so wondering what
> type of results I can get with a max of 1,600, just need to reduce feed
> rates I guess.
>
> Not having a manual, if anyone could also point out what shape profive I
> should use, having seen some 30 degree cutters at 3.2 mm dia from Japan or
> China I could fix the pin drill in the chuck if these would work.
>
> If anyone here in the Blackburn area with the capabilities to save me some
> time please get in touch as I need to have a VIN plate done.
>
> Cheers
>
> Adrian

I get great results milling 5mm high text in 6082 with a carbide 1.2mm ball 
nose, 3500rpm, 60mm per min, 0.2mm per pass. Usually 2 passes gives me a good 
engraving that polishes up very well. I use paraffin as coolant/lubricant gently 
brushing it on whilst clearing any chips.

I found these settings quite quickly but still break cutters if the work isn't 
exactly level.

I tried a 45 deg V bit but I get the impression that these work best at very 
high rpm's, the finish isn't a patch on the ball nose's at 3500rpm.

Muldoon wrote:

> I found these settings quite quickly but still break cutters if the work
> isn't exactly level.
> 
> I tried a 45 deg V bit but I get the impression that these work best at
> very high rpm's, the finish isn't a patch on the ball nose's at 3500rpm.

Thanks to you both for the replies, it will give me some thing to try out.

Adrian