I'm trying to get back to the model.https://tech.thk.com/en/products/pdf/en_a15_170.pdf#1try to look at this link, last page, last figure, is that what you are looking for?
Hi.
about ten years ago I made a transmission of this type, I had a long axis and rather than increase the diameter of the screw in order to maintain the critical velocity value decided to break the nail. at the time the rotary screws of the thk were not available for the Italian market, so I decided to design one that I had to carry out in drawing from the bb of casalcchio, which was also more economical. the characteristic point of the rotary ring is not so much the attack for the synchronous pulley but more than other the ball bearing that must allow it to spin and to do by means for the transmission of the bike. lubrication considerations should also be made. If they were to serve you, I must still have the drawings.I remember seeing years ago some balls for ball screws that had the particularity of a flange to be able to mount a pulley for toothed belt. the purpose was to motorize the group by turning the ring and holding the screw. Does anyone remember who produces them?
Thank you for your availability, as well as the others who have intervened. I was evaluating this solution as it was a retrofit on an existing machine, where the screw is fixed and the snail is rotated through a unimec pencil, but obtaining unsatisfactory performance as it repeats the positioning. However it seems that we are orienting ourselves on a traditional solution, also seen the limited racing.about ten years ago I made a transmission of this type, I had a long axis and rather than increase the diameter of the screw in order to maintain the critical velocity value decided to break the nail. at the time the rotary screws of the thk were not available for the Italian market, so I decided to design one that I had to carry out in drawing from the bb of casalcchio, which was also more economical. the characteristic point of the rotary ring is not so much the attack for the synchronous pulley but more than other the ball bearing that must allow it to spin and to do by means for the transmission of the bike. lubrication considerations should also be made. If they were to serve you, I must still have the drawings.
I think you do well, unless you have particular needs, I think it is always to prefer the solution of the rotation of the screw with a fixed ring, normally it provides a more rigid and quieter cinematic chain.Thank you for your availability, as well as the others who have intervened. I was evaluating this solution as it was a retrofit on an existing machine, where the screw is fixed and the snail is rotated through a unimec pencil, but obtaining unsatisfactory performance as it repeats the positioning. However it seems that we are orienting ourselves on a traditional solution, also seen the limited racing.
Could you kindly provide some extra indication?... the due considerations of lubrication must also be made. . .
If you have used a commercial component, I imagine that the lubricant feed channel is well studied by the manufacturer. the attention I referred to was more than anything else oriented to design and design. a traditional pigeon placed in rotation at high speeds would tend to "centrifugare" the lubricant outwards. in a specially designed rotary pigeon the lubricant must enter the body in rotation as much as possible near the slopes of the screw; I used a channel built in the body of the turns that support the snail.Could you kindly provide some extra indication?
on a machine of recent production in the company I had to use the rotary spiral solution on one of the boards. on this axis an early wear on the bottom of the rolling track at the contact area of the spheres occurred. the other axes (with comparable loads and sizes) adopt the rotary screw solution and with the same lubrication have not given problems.
Thank you.
Well, I didn't think about it, even because I should have patented something already existing.ahhhhh patent immediately.......
Why didn't you do it if I could ask?
Hi.
1) was not available then in Italy, at least thkabout ten years ago I made a transmission of this type, I had a long axis and rather than increase the diameter of the screw in order to maintain the critical velocity value decided to break the nail. at the time the rotary screws of the thk were not available for the Italian market, so I decided to design one that I had to carry out in drawing from the bb of casalcchio, which was also more economical.
ho seen che skf ha qualcosa:http://www.linearmotion.skf.com/en/0/fam-cat950fid189-rotating_nut_systems.htmlas well as hiwin (perhaps here the delivery times are normal):http://www.hiwin.com.tw/products.aspx?type=bs&subtype=bs_r1&zone=en-usGood morning
in an application I used a rocky chiocciolante of thk now I must repeat the same machine only that the delivery times are biblical someone knows some other company that produces such snails. . .
Thank you.
Mar
I'm late? ? ?ho seen che skf ha qualcosa:http://www.linearmotion.skf.com/en/0/fam-cat950fid189-rotating_nut_systems.htmlas well as hiwin (perhaps here the delivery times are normal):http://www.hiwin.com.tw/products.aspx?type=bs&subtype=bs_r1&zone=en-us