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#1
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How Fast Should A Trim Saw Run?
Hi,
I have an used Rock Rascal that I wish to use to section rocks and minerals. It does not currently have a motor. From reading supply websites, it would seem that a 1/3 hp 1725 motor is sold for it. Is there any advantage to using a more powerful or faster motor? Is there any advantage of using a variable speed motor? Thanks for any advice you might have to offer. TMT |
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#2
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How Fast Should A Trim Saw Run?
Too_Many_Tools wrote:
Hi, I have an used Rock Rascal that I wish to use to section rocks and minerals. It does not currently have a motor. From reading supply websites, it would seem that a 1/3 hp 1725 motor is sold for it. Is there any advantage to using a more powerful or faster motor? Is there any advantage of using a variable speed motor? Thanks for any advice you might have to offer. TMT I think a blade manufacturer (like Daniel Lopacki or Diamond Pacific) will have some reommended speed tables for the various sizes. In order to keep the surface feet per minute up - generally smaller tools must run at higher rpms. It also depends on the material you're cutting, whether you're using oil, wtaer with soluble lube, or propylene glycol coolants, etc. Carl -- to reply, change ( .not) to ( .net) |
#3
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How Fast Should A Trim Saw Run?
On Sat, 16 Sep 2006 15:40:03 GMT, "Too_Many_Tools"
discovered a keyboard and, for our edification and amusement, submitted Hi, I have an used Rock Rascal that I wish to use to section rocks and minerals. Please don't get in the habit of using a trim saw for sectioning and/or slabbing. A trim saw blade is designed for just that purpose: trimming. Hunking off slabs or sections of rock with a thin, delicate trim saw blade is asking for $100-a-pop blade replacements on a disgustingly regular basis... It does not currently have a motor. From reading supply websites, it would seem that a 1/3 hp 1725 motor is sold for it. Is there any advantage to using a more powerful or faster motor? None whatsoever. If you do, you'll probably just go through the diamond on the saw blade a lot faster - and the blades are the most expensive part of the saw... Is there any advantage of using a variable speed motor? No more so than using one on a wood saw. Just let the blade do the work. A steady pace and a steady feed does best. Thanks for any advice you might have to offer. TMT Blessed be, for sure... |
#4
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How Fast Should A Trim Saw Run?
On Sat, 16 Sep 2006 08:40:00 -0700, in rec.crafts.jewelry "Too_Many_Tools"
wrote: Hi, I have an used Rock Rascal that I wish to use to section rocks and minerals. It does not currently have a motor. From reading supply websites, it would seem that a 1/3 hp 1725 motor is sold for it. Is there any advantage to using a more powerful or faster motor? yes, to the sellers of the more powerful and faster motors, since they'll be able to make more money from you, selling you the bigger motor. To you, there's no advantage other than not having that pesky extra money around. A quarter to third horsepower motor at 1725 rpm is just fine for your small saw. Remember in use, you don't really want lots of extra pressure on the blade. It will cut best with just modest feed pressure. More than that will wear out the blade more quickly, not cut all that much faster, and will give you a less uniform cut. Be sure to use a proper lubricant for the type of blade you've got and the material being cut. Often it's just water with an additive to improve wetting and impede corrosion. Some materials though, cut better with cutting oils. Is there any advantage of using a variable speed motor? No. the saw blades have an optimum speed of operation. Find that from the manufacturer of your particular blade, or from a manufacturer of a similar type of blade. If you need to adjust the speed of the blade, this is normally done not with motor speed, but by choosing the appropriate pulley on the motor, since almost all these machines are belt driven. The blade speed depends on the pulley combination used on the machine and motor. The motors themselves can be very generic standard "washing machine" type motors. Used to be, you could pick them up for five or ten bucks as used motors at salvation army or similar stores, or yard sales. Anything more sophisticated than that is overkill for the saw. Now, for some combined lapidary units, it may be useful to have a dual speed motor, if you're running not just a saw, but several different types or sizes of sanding or buffing wheels too, since sometimes a slower or faster speed can be handy, especially when working with softer or more fragile materials. But just for sawing, that's not usually useful. Precision grinding machines like faceting machines often do have variable speed motors, and for that type of very picky grinding and polishing, it's quite useful, even essential sometimes. But those machines are a whole different ballpark than a rock raskal... Thanks for any advice you might have to offer. TMT |
#5
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How Fast Should A Trim Saw Run?
Thanks for the advice.
The trim saw will be used to section small stones for mineralogical work so it should work well for the intended use. TMT Too_Many_Tools wrote: Hi, I have an used Rock Rascal that I wish to use to section rocks and minerals. It does not currently have a motor. From reading supply websites, it would seem that a 1/3 hp 1725 motor is sold for it. Is there any advantage to using a more powerful or faster motor? Is there any advantage of using a variable speed motor? Thanks for any advice you might have to offer. TMT |
#6
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How Fast Should A Trim Saw Run?
As the ohter members said the trim saw is for slabs only. the Speed
for all Diamond saw blades is 3800-4200 Sufface feet a minut. If your coolent gets over 100- degree your cutting face temp is 265 degrees diamonds blow up at temps over 260 degrees. This comes from Dean at MK-blades, I have been using MK-blades for over 45 years and my Congo blades I still use though thay are rear Black diamond. Jack Cole Salem,Oregon Too_Many_Tools wrote: Hi, I have an used Rock Rascal that I wish to use to section rocks and minerals. It does not currently have a motor. From reading supply websites, it would seem that a 1/3 hp 1725 motor is sold for it. Is there any advantage to using a more powerful or faster motor? Is there any advantage of using a variable speed motor? Thanks for any advice you might have to offer. TMT |
#7
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How Fast Should A Trim Saw Run?
On Tue, 19 Sep 2006 22:00:55 -0700, in rec.crafts.jewelry "lapidaryrough"
wrote: As the ohter members said the trim saw is for slabs only. the Speed for all Diamond saw blades is 3800-4200 Sufface feet a minut. If your coolent gets over 100- degree your cutting face temp is 265 degrees diamonds blow up at temps over 260 degrees. This comes from Dean at MK-blades, I have been using MK-blades for over 45 years and my Congo blades I still use though thay are rear Black diamond. Jack Cole Salem,Oregon All true enough, with one exception. diamonds do not blow up at 260 degrees. they can take quite elevated temperatures. (like closer to 1200F). And when overheated, in the presence of oxygen, they don't blow up. The just slowly start to burn. makes the surface milky white and the stones cloudy on the surface. What your informate may have meant might have been the use of the words "blow up" as dramatic effect rather than accurate description. He may have meant that if the blade gets too hot (and perhaps 265 is too hot), that then the diamond sintered or imbedded/notched or plated cutting tool will be damaged, usually by loss of the diamond particles. It occurs to me that the rate of thermal expansion in diamond is significantly less than that rate in most metals. Perhaps what happens is that if the blade edge gets too hot, the metal expands more than the diamond particles imbedded in it, allowing the diamond particles to be less tightly gripped, and they then can be pulled out by the friction of the cutting action. Just a guess. Peter |
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