hi

I'm interested in starting a BUYING GROUP for CNC PROJECTS

I would approach different business for a big quantity purchase to obtain a discount which would be passed on to all of the people involved in the group.

Everyone is after a good buy and quality purchase , so here is a opportunity to start a BUYING GROUP.

Yes , i know there are hobby shops around but there prices are still expensive.

I'm interested in any feed back if people have any ideas and there thoughts on the concept.

Remember in the BUYING GROUP there will be no profit made , all discounts will be passed onto members.

Items in mind :

1. stepper motors
2. servo motors
3. DC motors
4. encoders
5. CNC Software
6. Cad or CadCam software
7. PCL boards
8. stepper motor controllers
9. servo motor controllers
10. ball screws , nuts , bearing and support housings brackets
11. linear slides abd blocks
12. power supplies

this is just some of the items on the list.

Who is interested in buying new DC motors for there lathe , mill , plasma table and router table CNC project. Just add a encoder and you have a beautiful servo motor with heaps of grunt for that next CNC project in mind.

you can veiw the motors on there website , which is about 2/3rd down on the page in http://www.73.com/a/0082.shtml

I already contacted a company that sells motors and they email me back.
Here is the result.

"Hello ,
We Thank you for your interest in contacting Surplus Traders.
We have the item available in stock :
Item Description : Ametek motor
Part No. : 965922-101
Available : 1,800 Units
Price / 10 : $70 USD / Ea. (Price is subjected to 10 Units).
Price / 50 : $67 USD / Ea. (Price is subjected to 50 Units).
Price / 100 : $55 USD / Ea. (Price is subjected to 100 Units).
Shipping weight : 7 -8 lbs. packed
Please advise us as soon as you can in order for us to reserve the goods in the warehouse.
In the event you wish to place a purchase order please note that requires 100% advance payment
Our Terms :
> -F.O.B. Plattsburg 12903 , NY,USA- (Prepaid for destinations outside of the USA.)
> -The Goods will ship within 10 Days of receipt of funds.
> -Payment by :Wire Transfer.
Please don't hesitate to contact me in anytime with any question or request
Return Policy
Requests for refunds or exchanges will be considered up to 14 days from date of purchase.
Any products to be returned must be unopened and in resalable condition. Software is non-returnable. Some returns may be subject to a restocking fee.
NOTE: A Return Materials Authorization Number (RMA) must be obtained prior to returning any product to us.
Please always send me some of your purchasing lists, and it will be a great appreciation.
Regards, "


AMETEK 38VDC 900 RPM MOTOR

900 RPM AMETEK, #965922-101. Permanent magnet DC motor rated 38 VDC nominal. Reversible, ball bearing. Max. rated rpm is 1300 max. Armature current before permanent demagnetization is 12 amps. Torque constant is 50 oz-in per amp. Terminal resistance 20 ohms +-20%. Voltage constant is 37 VDC per 1000 rpm. When tested on 38 VDC, we recorded the following data: No-load spedd 1100 rpm @ 0.260 amp. With a 100 oz-in load the shaft speed was 900 rpm @ 2.3 amps. When tested as a generator at 1000 rpm, the output was 5.8 amps @ 12 VDC. Shaft: 5/8" dia. X 1-5/16" long. The opposite end of the shaft has a turned down diameter and a flat mounting area with two sets of tapped holes. This was probably originally intended for an encoder or tachometer mounting. This shaft has an outside dia. of 3/16" and is approx. 3/8" long. We do not have the encoders whtat were mounted on this motor, but suitable encoders are probably available from encoder suppliers if required. The motor has five #10x32 tpi tapped mounting holes on the shaft end of the motor body. Electrical connections are via 3-1/2" long flexible wires. Dimensions: 4" dia. X 4-1/2" long (excluding shafts). 1,800 available. $74.50 Ea. MD548
--------------------------------------------------------------------------------
AMETEK 38VDC 900 RPM MOTOR WITH 5/8" DIA. OUTPUT SHAFT

900 RPM MOTOR AMETEK, #965922-102. Same specifications as our MD548 except the main output shaft is 5/8" dia. And 1-7/8" long. The encoder shaft at the other end of the motor is identical to the one described in the write-up of MD548. Approximately 1500 units available. Weight 7 pounds. $74.50 Ea. MD549

This is a idea that would make you and many other people savings on purchasing the good to do a CNC project.

Now if i had one hundred buyers , it is a huge savings from $74.50 ea USD down to $55.00 ea USD.

I need nine ( 9 ) servo motors for 3 projects i have in mind so doing , the sums ( 9*74.50 = $670.50 but in a group buy 9*55.00 = $495.00 , $670.50 - $495.00 = $175.50 ) i would save $175.50 USD which is a large savings.

And i'm sure there would be many other hobbyists in here who would be in the same position as me wanting to buy bulk for a few projects they have in mind or want to start straight away.

Guys lets see what you thoughts are on a BUYING GROUP

cheers

thats a lot of people to get on board before you get your discount, as im guessing most people will be after 3-4 motors. Personally i would choose the KOLLMORGEN PLATINUM SERIES PMI 24VDC MOTOR, as it has a pretty good torque rating, and its a quality brand, so you will be able to get a spec sheet for it. I have used similar motors in the past, and they are well built. (assuming the price is sane that is)

Also the kollmorgen has a built in tach, which you may well be able to pry off and replace with an encoder, as its double shafted.

thats a lot of people to get on board before you get your discount, as im guessing most people will be after 3-4 motors. Personally i would choose the KOLLMORGEN PLATINUM SERIES PMI 24VDC MOTOR, as it has a pretty good torque rating, and its a quality brand, so you will be able to get a spec sheet for it. I have used similar motors in the past, and they are well built. (assuming the price is sane that is)

Also the kollmorgen has a built in tach, which you may well be able to pry off and replace with an encoder, as its double shafted.

hi daedalus

I'm just psing this GROUP BUY and the savings people can make

I will be buying either way , but yes need at least 30 people

who sells the KOLLMORGEN PLATINUM SERIES PMI 24VDC MOTOR range of motors and how much ??

do you have a link and can you cut and paste it in here please .

cheers

ok , on the same website , i see

ok here is another interesting Torque Conversion Chart website http://www.merkle-korff.com/formulas.asp to convert oz-in's to something one is familar unit's.


Horsepower
Horsepower is a common unit for measuring the rate of doing work. When James Watt perfected the steam engine, he wished to compare its performance with that of a horse. It was estimated that a horse could raise a bail of cotton weighing 550 pounds vertically at a rate of one foot in one second. Therefore, the unit of horsepower was established at 550 ft-lbs. / sec. or 33,000 ft-lbs. / min.

In our industry we need to express horsepower in terms of rotory motion.

Circumference = 2 R

Therefore, the work accomplished can be expressed as follows:

HP = Force (F) (lbs) X Radius (R) X 2 X RPM

33,000 X 12 (in-lbs/min)

(F X R = T)

2

33,000 x 12
= 1

63,025



Therefore:

HP = Torque (T) (in-lbs) X RPM

63,025


or: T (in-lbs) = HP x 63,025

RPM



. . .

Gearmotor Construction

Glossary & Abbreviations

Conversion Formulas

Calculating Overhung Load

How to Select a Gearmotor

Accessories

Options

Just a note, if you google KOLLMORGEN PLATINUM SERIES PMI, there are datasheets available. Also the formulas above need continuous torque ratings for the motor, and the site lists instantaneous or peak torque, which isnt sustainable. The continuous torque rating for the kollmorgen is around 100oz/in.